Fix GitHub workflow

Author: mattn

.github/workflows/release.yml

@@ -13,11 +13,9 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@master
     - name: Setup Go
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v2
       with:
         go-version: 1.x
-    - name: Add $GOPATH/bin to $PATH
-      run: echo "::add-path::$(go env GOPATH)/bin"
     - name: Cross build
       run: make cross
     - name: Create Release
@@ -32,3 +30,4 @@ jobs:
       run: make upload
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+