changing workflow

.github/workflows/main.yml

@@ -10,3 +10,10 @@ jobs:
     steps:
     - name: Setup Go for use with actions
       uses: actions/setup-go@v1.0.0
+    with:
+      go-version: '1.13' # The Go version to download (if necessary) and use.
+    - name: Building
+      run: go build .
+    - name: Testing
+      run: go test ./...
+

go.mod

@@ -1 +1,3 @@
 module hamster-tycoon
+
+go 1.13