diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..a0717e4
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+*.go text eol=lf
\ No newline at end of file
diff --git a/.github/workflows/develop.yaml b/.github/workflows/develop.yaml
index 0e2d267..af8f33f 100644
--- a/.github/workflows/develop.yaml
+++ b/.github/workflows/develop.yaml
@@ -38,8 +38,6 @@ jobs:
           cd vendor/libgit2
           mkdir build && cd build
           cmake ..
-          make
-          sudo make install
           cd ../../..
           make install-static
           cd $GOPATH
@@ -135,8 +133,6 @@ jobs:
           cd vendor/libgit2
           mkdir build && cd build
           cmake ..
-          make
-          sudo make install
           cd ../../..
           make install-static
           cd $GOPATH
diff --git a/.github/workflows/golangci-lint.yml b/.github/workflows/golangci-lint.yml
new file mode 100644
index 0000000..ea81db0
--- /dev/null
+++ b/.github/workflows/golangci-lint.yml
@@ -0,0 +1,52 @@
+name: Reviewdog
+on:
+  push:
+    branches:
+      - develop
+      - master
+  pull_request:
+    branches:
+      - develop
+      - master
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    env:
+      GOPATH: ${{ github.workspace }}
+      GO111MODULE: auto
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15.x
+      - uses: actions/checkout@v2
+        with:
+          path: ./src/github.com/${{ github.repository }}
+          submodules: true
+      - name: Install apt dependecies
+        run: |
+          sudo apt-get install libgit2-dev libssh2-1-dev libssl-dev cmake
+      - name: Install go dependencies
+        run: |
+          go get -d github.com/Masterminds/sprig
+      - name: Install git2go
+        run: |
+          go get -d github.com/libgit2/git2go
+          cd $GOPATH/src/github.com/libgit2/git2go
+          git submodule update --init # get libgit2
+          cd vendor/libgit2
+          mkdir build && cd build
+          cmake ..
+          cd ../../..
+          make install-static
+          go get -v -d github.com/kilpkonn/gtm-enhanced
+      - name: golangci-lint
+        uses: reviewdog/action-golangci-lint@v1
+        with:
+          # Can pass --config flag to change golangci-lint behavior and target
+          # directory.
+          tool_name: Reviewdog
+          reporter: github-pr-check
+          golangci_lint_flags: "--config=.golangci.yml"
+          workdir: src/github.com/kilpkonn/gtm-enhanced
\ No newline at end of file
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 5514d7b..ecb7854 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -40,8 +40,6 @@ jobs:
           cd vendor/libgit2
           mkdir build && cd build
           cmake ..
-          make
-          sudo make install
           cd ../../..
           make install-static
           cd $GOPATH
@@ -186,8 +184,6 @@ jobs:
           cd vendor/libgit2
           mkdir build && cd build
           cmake ..
-          make
-          sudo make install
           cd ../../..
           make install-static
           cd $GOPATH
diff --git a/.golangci.yml b/.golangci.yml
new file mode 100644
index 0000000..46969fd
--- /dev/null
+++ b/.golangci.yml
@@ -0,0 +1,142 @@
+linters-settings:
+  depguard:
+    list-type: blacklist
+    packages:
+      # logging is allowed only by logutils.Log, logrus
+      # is allowed to use only in logutils package
+      - github.com/sirupsen/logrus
+    packages-with-error-message:
+      - github.com/sirupsen/logrus: "logging is allowed only by logutils.Log"
+  dupl:
+    threshold: 100
+  funlen:
+    lines: 180
+    statements: 80
+  gci:
+    local-prefixes: github.com/golangci/golangci-lint
+  goconst:
+    min-len: 2
+    min-occurrences: 3
+  gocritic:
+    enabled-tags:
+      - diagnostic
+      - experimental
+      - opinionated
+      - performance
+      - style
+    disabled-checks:
+      - dupImport # https://github.com/go-critic/go-critic/issues/845
+      - ifElseChain
+      - octalLiteral
+      - whyNoLint
+      - wrapperFunc
+  gocyclo:
+    min-complexity: 18
+  goimports:
+    local-prefixes: github.com/golangci/golangci-lint
+  golint:
+    min-confidence: 0
+  gomnd:
+    settings:
+      mnd:
+        # don't include the "operation" and "assign"
+        checks: argument,case,condition,return
+  govet:
+    check-shadowing: true
+    settings:
+      printf:
+        funcs:
+          - (github.com/golangci/golangci-lint/pkg/logutils.Log).Infof
+          - (github.com/golangci/golangci-lint/pkg/logutils.Log).Warnf
+          - (github.com/golangci/golangci-lint/pkg/logutils.Log).Errorf
+          - (github.com/golangci/golangci-lint/pkg/logutils.Log).Fatalf
+  lll:
+    line-length: 100
+  maligned:
+    suggest-new: true
+  misspell:
+    locale: US
+  nolintlint:
+    allow-leading-space: true # don't require machine-readable nolint directives (i.e. with no leading space)
+    allow-unused: false # report any unused nolint directives
+    require-explanation: false # don't require an explanation for nolint directives
+    require-specific: false # don't require nolint directives to be specific about which linter is being skipped
+
+linters:
+  # please, do not use `enable-all`: it's deprecated and will be removed soon.
+  # inverted configuration with `enable-all` and `disable` is not scalable during updates of golangci-lint
+  disable-all: true
+  enable:
+    - bodyclose
+    - deadcode
+    - depguard
+    - dogsled
+    - dupl
+    - errcheck
+    - exhaustive
+    - funlen
+    - gochecknoinits
+    - goconst
+    - gocritic
+    - gocyclo
+    - gofmt
+    - goimports
+    - golint
+    - gomnd
+    - goprintffuncname
+    - gosec
+    - gosimple
+    - govet
+    - ineffassign
+    - interfacer
+    - lll
+    - misspell
+    - nakedret
+    - noctx
+    - nolintlint
+    - rowserrcheck
+    - scopelint
+    - staticcheck
+    - structcheck
+    - stylecheck
+    - typecheck
+    - unconvert
+    - unparam
+    - unused
+    - varcheck
+    - whitespace
+
+  # don't enable:
+  # - asciicheck
+  # - gochecknoglobals
+  # - gocognit
+  # - godot
+  # - godox
+  # - goerr113
+  # - maligned
+  # - nestif
+  # - prealloc
+  # - testpackage
+  # - wsl
+
+issues:
+  # Excluding configuration per-path, per-linter, per-text and per-source
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - gomnd
+        - dupl
+        - funlen
+        - lll
+
+    # https://github.com/go-critic/go-critic/issues/926
+    - linters:
+        - gocritic
+      text: "unnecessaryDefer:"
+
+
+run:
+  # default concurrency is a available CPU number
+  concurrency: 4
+  # timeout for analysis, e.g. 30s, 5m, default is 1m
+  deadline: 4m
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 754b8a2..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,35 +0,0 @@
-language: go
-
-os:
-  - linux
-  - osx
-
-go:
-  - "1.10"
-
-before_install:
-  - make git2go
-  - go get github.com/mattn/goveralls
-
-before_deploy:
-  - go build -v --tags static -ldflags "-X main.Version=${TRAVIS_TAG}"
-  - v=$(${PWD}/gtm verify "${TRAVIS_TAG}"); echo "$v"; if [ ! "$v" == "true" ]; then exit 1; fi
-  - tar -zcf gtm.${TRAVIS_TAG}.${TRAVIS_OS_NAME}.tar.gz gtm
-  - shasum -a 256 gtm.${TRAVIS_TAG}.${TRAVIS_OS_NAME}.tar.gz > gtm.${TRAVIS_TAG}.${TRAVIS_OS_NAME}.checksum.txt
-
-script:
-  - go get -d ./...
-  - $HOME/gopath/bin/goveralls -v -flags=--tags=static -service=travis-ci
-
-deploy:
-  provider: releases
-  api_key:
-    secure: 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
-  file:
-    - "gtm.${TRAVIS_TAG}.${TRAVIS_OS_NAME}.tar.gz"
-    - "gtm.${TRAVIS_TAG}.${TRAVIS_OS_NAME}.checksum.txt"
-  skip_cleanup: true
-  overwrite: true
-  on:
-    tags: true
-    repo: git-time-metric/gtm
diff --git a/Makefile b/Makefile
deleted file mode 100644
index 946485c..0000000
--- a/Makefile
+++ /dev/null
@@ -1,90 +0,0 @@
-BINARY         = bin/gtm
-VERSION        = 0.0.0-dev
-COMMIT         = $(shell git show -s --format='%h' HEAD)
-LDFLAGS        = -ldflags "-X main.Version=$(VERSION)-$(COMMIT)"
-GIT2GO_VERSION = v27
-GIT2GO_PATH    = $(GOPATH)/src/github.com/libgit2/git2go
-LIBGIT2_PATH   = $(GIT2GO_PATH)/vendor/libgit2
-PKGS           = $(shell go list ./... | grep -v vendor)
-BUILD_TAGS     = static
-
-build:
-	go build --tags '$(BUILD_TAGS)' $(LDFLAGS) -o $(BINARY)
-
-debug: BUILD_TAGS += debug
-debug: build
-
-profile: BUILD_TAGS += profile
-profile: build
-
-debug-profile: BUILD_TAGS += debug profile
-debug-profile: build
-
-test:
-	@go test $(TEST_OPTIONS) --tags '$(BUILD_TAGS)' $(PKGS) | grep --colour -E "FAIL|$$"
-
-test-verbose: TEST_OPTIONS += -v
-test-verbose: test
-
-lint:
-	-@$(call color_echo, 4, "\nGo Vet"); \
-		go vet --all --tags '$(BUILD_TAGS)' $(PKGS)
-	-@$(call color_echo, 4, "\nError Check"); \
-		errcheck -ignoretests -tags '$(BUILD_TAGS)' $(PKGS)
-	-@$(call color_echo, 4, "\nIneffectual Assign"); \
-		ineffassign ./
-	-@$(call color_echo, 4, "\nStatic Check"); \
-		staticcheck --tests=false --tags '$(BUILD_TAGS)' $(PKGS)
-	-@$(call color_echo, 4, "\nGo Simple"); \
-		gosimple --tests=false --tags '$(BUILD_TAGS)' $(PKGS)
-	-@$(call color_echo, 4, "\nUnused"); \
-		unused --tests=false --tags '$(BUILD_TAGS)' $(PKGS)
-	-@$(call color_echo, 4, "\nGo Lint"); \
-		golint $(PKGS)
-	-@$(call color_echo, 4, "\nGo Format"); \
-		go fmt $(PKGS)
-	-@$(call color_echo, 4, "\nLicense Check"); \
-		ag --go -L license . |grep -v vendor/
-
-install:
-	go install --tags '$(BUILD_TAGS)' $(LDFLAGS)
-
-clean:
-	go clean
-	rm bin/*
-
-git2go-install:
-	[[ -d $(GIT2GO_PATH) ]] || git clone https://github.com/libgit2/git2go.git $(GIT2GO_PATH) && \
-	cd ${GIT2GO_PATH} && \
-	git pull && \
-	git checkout -qf $(GIT2GO_VERSION) && \
-	git submodule update --init
-
-git2go: git2go-install
-	cd $(LIBGIT2_PATH) && \
-	mkdir -p install/lib && \
-	mkdir -p build && \
-	cd build && \
-	cmake -DTHREADSAFE=ON \
-		  -DBUILD_CLAR=OFF \
-		  -DBUILD_SHARED_LIBS=OFF \
-		  -DCMAKE_C_FLAGS=-fPIC \
-		  -DUSE_SSH=OFF \
-		  -DCURL=OFF \
-		  -DUSE_HTTPS=OFF \
-		  -DUSE_BUNDLED_ZLIB=ON \
-		  -DCMAKE_BUILD_TYPE="RelWithDebInfo" \
-		  -DCMAKE_INSTALL_PREFIX=../install \
-		  .. && \
-	cmake --build .
-
-git2go-clean:
-	[[ -d $(GIT2GO_PATH) ]] && rm -rf $(GIT2GO_PATH)
-
-define color_echo
-      @tput setaf $1
-      @echo $2
-      @tput sgr0
-endef
-
-.PHONY: build test vet fmt install clean git2go-install git2go-build all-tags profile debug
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index 62ac80d..0000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,40 +0,0 @@
-version: "{build}"
-
-os: Visual Studio 2015
-
-clone_folder: c:\gopath\src\github.com\git-time-metric\gtm
-
-skip_branch_with_pr: true
-
-environment:
-  GOVERSION: 1.9.7
-  GOPATH: c:\gopath
-  PROJ_DIR: /c/gopath/src/github.com/git-time-metric/gtm
-
-install:
-  - rmdir c:\go /s /q
-  - appveyor DownloadFile https://storage.googleapis.com/golang/go%GOVERSION%.windows-amd64.msi
-  - msiexec /i go%GOVERSION%.windows-amd64.msi /q
-  - go version
-  - go env
-
-build_script:
-  - c:\msys64\usr\bin\bash -lc "cd ${PROJ_DIR} && make git2go-install"
-  - c:\msys64\usr\bin\bash -lc "/c/gopath/src/github.com/kilpkonn/gtm-enhanced/script/appveyor-build.sh"
-
-artifacts:
-  - path: gtm.$(appveyor_repo_tag_name).windows.tar.gz
-    name: gtm.zip
-
-  - path: 'gtm.developer-build-*.windows.tar.gz'
-    name: gtm-developer.tar.gz
-
-deploy:
-  description: ''
-  provider: GitHub
-  auth_token:
-    secure: O47of1Osqbk2qkk1Vn228XXF/YDwev5j5YHyNPzEPJR1pxuqwPaqlvsFDVUYQoiu
-  artifact: gtm.zip
-  force_update: true
-  on:
-    appveyor_repo_tag: true
diff --git a/script/appveyor-build.sh b/script/appveyor-build.sh
deleted file mode 100755
index 34f7568..0000000
--- a/script/appveyor-build.sh
+++ /dev/null
@@ -1,54 +0,0 @@
-#!/bin/bash
-
-set -ex
-
-export PATH=/c/msys64/mingw64/bin:/c/msys64/usr/bin:/c/Go/bin:/c/gopath/go/bin:$PATH
-
-GIT2GO_PATH="${GOPATH}/src/github.com/libgit2/git2go"
-LIBGIT2_BUILD="${GIT2GO_PATH}/vendor/libgit2/build"
-mkdir -p "${LIBGIT2_BUILD}"
-cd "${LIBGIT2_BUILD}"
-FLAGS="-lws2_32"
-export CGO_LDFLAGS="${LIBGIT2_BUILD}/libgit2.a -L${LIBGIT2_BUILD} ${FLAGS}"
-
-cmake -DTHREADSAFE=ON \
-      -DBUILD_CLAR=OFF \
-      -DBUILD_SHARED_LIBS=OFF \
-      -DCMAKE_C_FLAGS=-fPIC \
-      -DCMAKE_BUILD_TYPE="RelWithDebInfo" \
-      -DCMAKE_INSTALL_PREFIX=../install \
-      -DWINHTTP=OFF \
-      -DUSE_BUNDLED_ZLIB=ON \
-      -DUSE_HTTPS=OFF \
-      -DUSE_SSH=OFF \
-      -DCURL=OFF \
-      -G "MSYS Makefiles" \
-      .. &&
-cmake --build .
-
-cd "${GOPATH}/src/github.com/git-time-metric/gtm"
-go get -d ./...
-go test --tags static $(go list ./... | grep -v vendor)
-if [[ "${APPVEYOR_REPO_TAG}" = true ]]; then
-    version=${APPVEYOR_REPO_TAG_NAME}
-    go build -v --tags static -ldflags "-X main.Version=${version}"
-
-    # make sure version is set correctly
-    v="$(${GOPATH}/src/github.com/kilpkonn/gtm-enhanced/gtm.exe verify ${version})"
-    if [ ! "$v" == "true" ]; then
-        exit 1
-    fi
-
-    tar -zcf "gtm.${APPVEYOR_REPO_TAG_NAME}.windows.tar.gz" gtm.exe
-else
-    version='0.0.0-dev'
-    go build -v --tags static -ldflags "-X main.Version=${version}"
-
-    # make sure version is set correctly
-    v="$(${GOPATH}/src/github.com/kilpkonn/gtm-enhanced/gtm.exe verify ${version})"
-    if [ ! "$v" == "true" ]; then
-        exit 1
-    fi
-
-    tar -zcf "gtm.developer-build-${version}.windows.tar.gz" gtm.exe
-fi
diff --git a/util/date_test.go b/util/date_test.go
index 163bdc9..9168a23 100644
--- a/util/date_test.go
+++ b/util/date_test.go
@@ -5,24 +5,12 @@
 package util
 
 import (
-	"fmt"
 	"testing"
 	"time"
 
 	"github.com/jinzhu/now"
 )
 
-func printDates() {
-	fmt.Printf("%+10s %s\n", "Today", TodayRange())
-	fmt.Printf("%+10s %s\n", "Yesterday", YesterdayRange())
-	fmt.Printf("%+10s %s\n", "ThisWeek", ThisWeekRange())
-	fmt.Printf("%+10s %s\n", "LastWeek", LastWeekRange())
-	fmt.Printf("%+10s %s\n", "ThisMonth", ThisMonthRange())
-	fmt.Printf("%+10s %s\n", "LastMonth", LastMonthRange())
-	fmt.Printf("%+10s %s\n", "ThisYear", ThisYearRange())
-	fmt.Printf("%+10s %s\n", "LastYear", LastYearRange())
-}
-
 func TestDateRanges(t *testing.T) {
 	tm, err := time.Parse("2006-Jan-02", "2015-Jul-01")
 	if err != nil {