Add Go 1.16 to tested Go versions (#255)

Author: lukasberger

.github/workflows/ci.yml

@@ -11,8 +11,7 @@ jobs:
  runs-on: ubuntu-latest
  strategy:
  matrix:
- go-version: [ '1.11.x', '1.12.x', '1.13.x', '1.14.x', '1.15.x']
-
+ go-version: [ '1.11.x', '1.12.x', '1.13.x', '1.14.x', '1.15.x', '1.16.x']
  steps:
  - name: Set up Go
  uses: actions/setup-go@v2