The release process for deploying webpack is actually quite painless. Read through the following steps, so you have a clear understanding of how it's done.
When merging pull requests into the master
branch, select the Create Merge Commit option.
npm version patch && git push --follow-tags && npm publish
npm version minor && git push --follow-tags && npm publish
npm version major && git push --follow-tags && npm publish
This will increment the package version, commits the changes, cuts a local tag, push to github & publish the npm package.
After that go to the github releases page and write a Changelog for the new tag.