add go 1.16 to github actions workflow

Author: thatoddmailbox

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        go-version: [ '1.13', '1.14', '1.15' ]
+        go-version: [ '1.13', '1.14', '1.15', '1.16' ]
 
     steps:
     - name: Set up Go ${{ matrix.go-version }}