add Go 1.16 to the test matrix (#1562)

Author: amnonbc

.github/workflows/tests.yml

@@ -8,7 +8,7 @@ jobs:
   test:
     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]
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps: