CI: run on 1.6 only once (#432)

Author: inkydragon

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.6' # lowest supported version; though possibly with errors
+          # - '1.6' # lowest supported version; though possibly with errors
           - '1.6' # LTS support
           - '1'   # last released version
         os: