Update go.yml

Author: andyzhangx

.github/workflows/go.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Set up Go 1.x
       uses: actions/setup-go@v2
       with:
-        go-version: ^1.13
+        go-version: '^1.12.1'
       id: go
 
     - name: Check out code into the Go module directory