Release-Checklist.md

@@ -3,7 +3,13 @@
 - Review [milestones](https://github.com/openapitools/openapi-generator/milestones) to ensure there are no outstanding issues/PRs that need to be urgently addressed before the release.
 - Create the next milestone (e.g. 3.0.3 if the current version if 3.0.2-SNAPSHOT)
 - Update **open** PRs, issues of the current milestone (e.g. 3.0.2) to the next milestone (3.0.3)
-- update dependencies if needed (core, parser versions...) (e.g. [#4889](https://github.com/swagger-api/swagger-codegen/pull/4889)), if needed
+- update dependencies if needed (core, parser versions...) (e.g. [#4889](https://github.com/swagger-api/swagger-codegen/pull/4889)), if needed. For issues, here are the steps:
+  - Go to the [issue tracker](https://github.com/OpenAPITools/openapi-generator/issues)
+  - Click on the drop-down menu "Milestones" and select `3.0.2` (current milestone)
+  - After the page loading completes (which show all issues for the milestone `3.0.2`), click on the checkbox next to the issue counter (right below `Clear current search query, filters, and sorts`) to select all issues in the current page
+  - Click again on the drop-down menu "Milestones" to change the milestones of these selected issues to `3.0.3`
+  - Repeat until all issues have been updated with the new milestones
+  - (the same procedure can be applied to updating the PR's milestone)
 - File a PR: (e.g. [#280](https://github.com/OpenAPITools/openapi-generator/pull/280))
   -  to remove the SNAPSHOT version (script `bin/utils/release_version_update.sh` can be used, e.g. `bin/utils/release_version_update.sh 3.0.2-SNAPSHOT 3.0.2`)
   -  to update the OpenAPI Generator Online's Dockerfile to use the stable version. (script `bin/utils/release_version_update.sh` can be used)