Add Ruby 3.0 support

HarlemSquirrel · HarlemSquirrel · commit 1b21d99f4bf5 · 2021-01-30T14:12:50.000-05:00
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
@@ -22,6 +22,7 @@ jobs:
           - "2.5"
           - "2.6"
           - "2.7"
+          - "3.0"
           - "jruby-9.2"
     steps:
     - uses: actions/checkout@v2
