Upgrade readme action from v1 to v2 (#236)

Author: goruha

.github/workflows/shared-atmos-readme.yml

@@ -38,11 +38,12 @@ jobs:
           fetch-depth: 0
           token: ${{ steps.github-app.outputs.token }}
 
-      - uses: cloudposse-github-actions/readme@v1
+      - uses: cloudposse-github-actions/readme@v2
         with:
           token: ${{ steps.github-app.outputs.token }}
           readme_enabled: true
           banner_enabled: true
           validate_readme: true
           commit_method: 'commit'
           commit_push_options: '--force-with-lease'
+          command: readme