Add parallel code coverage GHA config

Author: jasonmcintosh

.github/workflows/test.yaml

@@ -18,9 +18,21 @@ jobs:
         key: go-${{ hashFiles('**/go.sum') }}
     - name: Checkout Code
       uses: actions/checkout@v2
+
     - name: Test Plank
-      run: go test -v -race -covermode atomic -coverprofile=profile.cov ./... 
+      run: go test -v -race -covermode atomic -coverprofile=profile.cov ./...
+
     - name: Send Coverage
       uses: shogo82148/actions-goveralls@v1
       with:
+        parallel: true
+        flag-name: Go-${{ matrix.go-version }}
         path-to-profile: profile.cov
+
+  finish:
+    needs: test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: shogo82148/actions-goveralls@v1
+        with:
+          parallel-finished: true