Fix Coveralls integration (joeig#25)

Author: joeig

.github/workflows/tests.yml

@@ -36,19 +36,9 @@ jobs:
         uses: actions/checkout@v1
       - name: Make
         run: make
-      - name: Convert coverage to lcov
-        uses: jandelgado/gcov2lcov-action@v1.0.0
-        with:
-          infile: c.out
-          outfile: c.lcov
-      - name: Coveralls Parallel
-        uses: coverallsapp/github-action@v1.0.1
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          parallel: true
-          path-to-lcov: c.lcov
-      - name: Coveralls Finished
-        uses: coverallsapp/github-action@v1.0.1
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          parallel-finished: true
+      - name: Coveralls
+        env:
+          COVERALLS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          go get github.com/mattn/goveralls
+          $(go env GOPATH)/bin/goveralls -coverprofile=c.out -service=github