Re-enable testing on nightly.

Author: maleadt

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
           - '1.3'
           - '1.4'
           - '1.5'
-          # - 'nightly'
+          - 'nightly'
         os:
           - ubuntu-latest
           - macOS-latest