chore: codecov integration

Author: repeale

.github/workflows/go.yml

@@ -21,4 +21,7 @@ jobs:
         run: go build -v ./...
 
       - name: Test
-        run: go test -v ./...
+        run: go test -race -coverprofile=coverage.xml -covermode=atomic -v ./...
+      - uses: codecov/codecov-action@v1
+        with:
+          files: ./coverage.xml