fix CI versions

Author: stevengj

.github/workflows/CI.yml

@@ -23,8 +23,8 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.11'
-          - '1.6'
+          - '1.7'
+          - '1'
           - 'pre'
         os:
           - ubuntu-latest