Add coveralls (#16)

Author: fmenezes

.github/workflows/go.yml

@@ -34,4 +34,11 @@ jobs:
       run: go build -v .
 
     - name: Test
-      run: go test -v .
+      run: go test -v -race -covermode atomic -coverprofile=profile.cov .
+
+    - name: Send coverage
+      env:
+        COVERALLS_TOKEN: ${{ secrets.COVERALLS_TOKEN }}
+      run: |
+        go get github.com/mattn/goveralls
+        $(go env GOPATH)/bin/goveralls -repotoken $COVERALLS_TOKEN -coverprofile=profile.cov

README.md

@@ -1,5 +1,6 @@
 [![Go](https://github.com/fmenezes/codeowners/workflows/Go/badge.svg)](https://github.com/fmenezes/codeowners/actions?query=branch%3Amaster)
 [![Go Report Card](https://goreportcard.com/badge/github.com/fmenezes/codeowners)](https://goreportcard.com/report/github.com/fmenezes/codeowners)
+[![Coverage](https://coveralls.io/repos/github/fmenezes/codeowners/badge.svg?branch=master)](https://coveralls.io/github/fmenezes/codeowners?branch=master)
 
 # CODEOWNERS Decoder