fix: go version for ci

Author: 54m

.github/workflows/go.yml

@@ -13,10 +13,10 @@ jobs:
       GO111MODULE: on
 
     steps:
-      - name: Set up Go 1.12
-        uses: actions/setup-go@v1
+      - name: Set up Go ^1.13
+        uses: actions/setup-go@v2
         with:
-          go-version: 1.12
+          go-version: '^1.13'
         id: go
 
       - uses: actions/checkout@v2