Add more rbs version to ci

Author: tompng

.github/workflows/test.yml

@@ -35,7 +35,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rbs: ['latest', '3.0', '2.7.0']
+        rbs: ['latest', '3.4', '3.2', '3.0', '2.7.0']
     env:
       GEMFILE_RBS_VERSION: ${{ matrix.rbs }}
     steps: