test on latest 1 version and stop testing on very old julia versions

Author: KristofferC

.github/workflows/CI.yml

@@ -14,11 +14,8 @@ jobs:
       matrix:
         version:
           - '1.0'
-          - '1.1'
-          - '1.2'
-          - '1.3'
-          - '1.4'
           - '1.5'
+          - '1'
           - 'nightly'
         os:
           - ubuntu-latest