chore: don't make ruby 3.0 experimental any more

Author: bethesque

.github/workflows/test.yml

@@ -9,11 +9,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby_version: ["2.2", "2.7"]
+        ruby_version: ["2.2", "2.7", "3.0"]
         experimental: [false]
-        include:
-          - ruby_version: "3.0"
-            experimental: true
     steps:
       - uses: actions/checkout@v2
       - uses: ruby/setup-ruby@v1