Clean up and prepare release

.travis.yml

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+language: rust
+sudo: required
+services: docker
+cache: cargo
+
+before_cache:
+  - rm -rf "$TRAVIS_HOME/.cargo/registry/src"
+
+DEPLOY_TO_GITHUB: &DEPLOY_TO_GITHUB
+  before_deploy:
+    - git config --local user.name "Helium CI"
+    - git config --local user.email "[email protected]"
+    - name="virtual-lorawan-device-$TRAVIS_TAG-$TARGET"
+    - mkdir $name
+    - cp target/$TARGET/release/virtual-lorawan-device$EXE $name/
+    - cp LICENSE $name/
+    - cp README.md $name/
+    - zip -r $name.zip $name
+  deploy:
+    provider: releases
+    api_key: $GITHUB_TOKEN
+    file: virtual-lorawan-device-$TRAVIS_TAG-$TARGET.zip
+    skip_cleanup: true
+    on:
+      branch: master
+      tags: true
+
+matrix:
+  include:
+  - name: Linux Binary
+    env: TARGET=x86_64-unknown-linux-gnu
+    rust: stable
+    before_script:
+      - rustup target add $TARGET
+      - rustup component add rustfmt
+      - rustup component add clippy
+    script:
+      - cargo fmt -- --check
+      - cargo build --release --target $TARGET --locked
+      - cargo clippy -- --deny=clippy::all
+    <<: *DEPLOY_TO_GITHUB
+
+  - name: macOS Binary
+    env: MACOSX_DEPLOYMENT_TARGET=10.7 TARGET=x86_64-apple-darwin
+    os: osx
+    rust: stable
+    before_script:
+      - rustup target add $TARGET
+      - rustup component add rustfmt
+      - rustup component add clippy
+    script:
+      - cargo fmt -- --check
+      - cargo build --release --target $TARGET --locked
+      - cargo clippy -- --deny=clippy::all
+    <<: *DEPLOY_TO_GITHUB
+
+  - name: Windows Binary
+    env: TARGET=x86_64-pc-windows-gnu EXE=.exe
+    rust: stable
+    before_script:
+      - rustup target add $TARGET
+      - rustup component add rustfmt
+      - rustup component add clippy
+    script:
+      - cargo fmt -- --check
+      - RUSTFLAGS="-C linker=x86_64-w64-mingw32-gcc" cargo build --release --target $TARGET --locked
+      - cargo clippy -- --deny=clippy::all
+    <<: *DEPLOY_TO_GITHUB

CHANGELOG.md

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+<!--
+M.m.p (YYYY-MM-DD)
+==================
+Add a summary of this release.
+
+**BREAKING CHANGES**:
+
+* Some change which breaks API or ABI compatiblity with.
+
+
+Feature enhancements:
+
+* [Link to github PR]():
+  A new feature.
+
+Bug fixes:
+
+* [Link to github PR]():
+  A bugfix.
+-->
+0.1.0 (2020-06-02)
+==================
+Initial release:
+* Miner connection is optionally configurable via command line
+* device credentials and uplink rate defined via lorawan-device.json
+* tolerates ACK packets only
+* prints timeliness of Downlinks relative to RxWindow1