workflows: test on Go 1.16

Author: bgilbert

.github/workflows/go.yml

@@ -12,7 +12,7 @@ jobs:
     name: test build
     strategy:
       matrix:
-        go-version: [1.13.x, 1.14.x, 1.15.x]
+        go-version: [1.13.x, 1.14.x, 1.15.x, 1.16.x]
     runs-on: ubuntu-latest
     steps:
     - name: Set up Go 1.x