fixing

.github/workflows/main.yml

@@ -12,8 +12,13 @@ jobs:
       uses: actions/setup-go@v1.0.0
       with:
         go-version: '1.13' # The Go version to download (if necessary) and use.
+
+    - name: Check out code
+      uses: actions/checkout@v1
+
     - name: Building
       run: go build .
+
     - name: Testing
       run: go test ./...