Update go version in runner

Author: jotaen

.github/workflows/release.yml

@@ -47,7 +47,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.15.5'
+          go-version: '1.16'
       - name: Build binary
         env:
           GOOS: ${{ matrix.go_os }}