doc: flow description in readme

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## merge-release ## merge-release
GitHub Action for automated npm publishing. GitHub Action for automated npm publishing.
This Action publishes a package to npm. It is meant to be used on every successful merge to master but
you'll need to configured that workflow yourself. You can look to the `.github/main.workflow` file in this
project as an example.
### Flow
* Check for the latest version number published to npm.
* Lookup all commits between the git commit that triggered the action and the latest publish.
* If the package hasn't been published or the prior publish does not include a git hash, we'll
only pull the commit data that triggered the action.
* Based on the commit messages, increment the version from the lastest release.
* If the string "BREAKING CHANGE" is found anywhere in any of the commit messages or descriptions the major
version will be incremented.
* If a commit message begins with the string "feat" then the minor version will be increased. This works
for most common commit metadata for feature additions: `"feat: new API"` and `"feature: new API"`.
* All other changes will increment the patch version.
* Publish to npm using the configured token.