ci.yml in zx-monads-0.0.5

- old
+ new

@@ -8,10 +8,10 @@
 jobs:
   rspec:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['2.7', '3.0', '3.1', '3.2']
+        ruby-version: ['2.7', '3.0', '3.1', 'head']
 
     steps:
     - uses: actions/checkout@v3
       
     - name: Set up Ruby