Merge pull request #277 from rspec/add-3-0-final

Add 3.0.0

Author: JonRowe

ci/.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - 3.0.0-rc1
+          - 3.0
           - 2.7
           - 2.6
           - 2.5