use v2 actions

.github/workflows/go.yml

@@ -5,16 +5,14 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-    - name: Set up Go 1.13
-      uses: actions/setup-go@v1
+    - name: Set up Golang
+      uses: actions/setup-go@v2
       with:
-        go-version: 1.13
-      id: go
+        go-version: '^1.13.1'
+    - run: go version
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v1
-      with:
-        fetch-depth: 1
+      uses: actions/checkout@v2
 
     - name: install dependencies
       run: go mod download