use newer go versions to run tests: now with colons

Author: marcel corso

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        go-version: [ 1.16.x 1.17.x 1.18.x]
+        go-version: [ 1.16.x, 1.17.x, 1.18.x]
 
     name: Go ${{ matrix.go-version }}