NO-ISSUE Bump up version automatically

Author: Yang-33

.github/workflows/diff-check.yml

@@ -20,17 +20,23 @@ jobs:
           python-version: '3.x'
       - name: Generate codes
         run: python generate-code.py
+      - name: Install bump
+        run: pip install bump
       - name: Mark if diff exists
         run: |
           diff=$(git --no-pager diff --name-only)
           echo "DIFF_IS_EMPTY=$([[ -z "$diff" ]] && echo 'true' || echo 'false')" >> $GITHUB_ENV
           echo "CURRENT_DATETIME=$(date +'%Y%m%d%H%M%S')" >> $GITHUB_ENV
+
+      ## TODO: Enable merge change into master directly
       - name: Open pull request if generated code is not same as current one
         if: ${{ env.DIFF_IS_EMPTY != 'true' }}
         run: |
           git config user.name github-actions
           git config user.email github-actions@github.com
           git checkout -b update-diff-${{ env.CURRENT_DATETIME }}
+          bump -m -r linebot/__about__.py
+          python generate-code.py
           git add .
           git commit -m "Codes are generated by openapi"
           git push origin update-diff-${{ env.CURRENT_DATETIME }}