remove ruby 2.2 from CI

since it does not support logger

Author: jcupitt

.github/workflows/test.yml

@@ -38,7 +38,6 @@ jobs:
       matrix:
         os-version: [ 'ubuntu-20.04' ]
         ruby-version:
-          - '2.2'
           - '2.3'
           - '2.4'
           - '2.5'