Update ci.yml

Author: ewjoachim

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
 
       - name: Store Pull Request comment to be posted
         uses: actions/upload-artifact@v2
-        if: steps.coverage_comment.outputs.COMMENT_FILE_WRITTEN == "true"
+        if: steps.coverage_comment.outputs.COMMENT_FILE_WRITTEN == 'true'
         with:
           # If you use a different name, update COMMENT_ARTIFACT_NAME accordingly
           name: python-coverage-comment-action