go: add go.mod file, run go mod tidy and vendor (#199)

Author: dawidd6

go.mod

@@ -0,0 +1,18 @@
+module github.com/ultralist/ultralist
+
+go 1.14
+
+require (
+	github.com/cheynewallace/tabby v1.1.0
+	github.com/fatih/color v1.9.0
+	github.com/jinzhu/copier v0.0.0-20190924061706-b57f9002281a
+	github.com/julienschmidt/httprouter v1.3.0
+	github.com/manifoldco/promptui v0.7.0
+	github.com/myesui/uuid v1.0.0 // indirect
+	github.com/skratchdot/open-golang v0.0.0-20200116055534-eef842397966
+	github.com/spf13/cobra v1.0.0
+	github.com/spf13/viper v1.7.0
+	github.com/stretchr/testify v1.6.1
+	github.com/twinj/uuid v1.0.0
+	gopkg.in/stretchr/testify.v1 v1.2.2 // indirect
+)