Updates release versions (#240)

Author: cheqianh

.github/workflows/release.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ '3.6', '3.7', '3.8', '3.9', '3.10', 'pypy-3.6', 'pypy-3.7', 'pypy-3.8' ]
+        python-version: ['3.7', '3.8', '3.9', '3.10', 'pypy-3.7', 'pypy-3.8' ]
     steps:
       - uses: actions/checkout@v3
       - name: Set up python