Merge pull request #120 from gogainda/master

Add Truffleruby head to CI

Author: flavorjones

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["2.2", "2.3", "2.4", "2.5", "2.6", "2.7", "3.0", "ruby-head"]
+        ruby: ["2.2", "2.3", "2.4", "2.5", "2.6", "2.7", "3.0", "ruby-head", truffleruby-head]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2