add go matrix and goverall action

.github/workflows/go.yaml

@@ -2,16 +2,19 @@ name: go-build
 on: [push, pull_request]
 jobs:
   build:
-    name: build, test, lint
+    name: build ( ${{ matrix.go }} ), test, lint
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go: [ '1.15', '1.14', '1.13' ]
     steps:
-      - name: Set up Go 1.13
-        uses: actions/setup-go@v1
-        with:
-          go-version: 1.13
-
       - name: Check out source code
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go }}
 
       - name: Build
         env:
@@ -21,10 +24,23 @@ jobs:
       - name: Test
         env:
           GOPROXY: "https://proxy.golang.org"
-        run: go test -v ./...
+        run: go test -v -race -coverprofile=coverage.out ./...
 
       - name: Install golangci-lint
         run: curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh| sh -s -- -b $(go env GOPATH)/bin v1.20.0
 
       - name: Run golangci-lint
-        run: $(go env GOPATH)/bin/golangci-lint run -E golint -E gosec -E gofmt
+        run: golangci-lint run -E golint -E gosec -E gofmt
+
+      - name: convert to lcov
+        if: ${{ matrix.go }} == '1.15'
+        run: |
+          go get -u github.com/jandelgado/gcov2lcov
+          gcov2lcov -infile=coverage.out -outfile=coverage.lcov
+
+      - name: Coveralls
+        uses: coverallsapp/github-action@master
+        if: ${{ matrix.go }} == '1.15'
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: coverage.lcov