ci.yml in prometheus_exporter-2.0.8

- old
+ new

@@ -18,10 +18,10 @@
       BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/ar_${{ matrix.activerecord }}.gemfile
 
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['2.6', '2.7', '3.0', '3.1']
+        ruby: ['2.6', '2.7', '3.0', '3.1', '3.2']
         activerecord: [60, 61]
 
     steps:
       - uses: actions/checkout@v2
 