docs: update hyperlink (googleapis#411)

Author: jef

README.md

@@ -47,7 +47,7 @@ Automate releases with Conventional Commit Messages.
 | input | description |
 |:---:|---|
 | `token` | A GitHub secret token, the action defaults to using the special `secrets.GITHUB_TOKEN` |
-| `release-type` | What type of project is this a release for? Reference [Release types supported](#release-types-supported); new types of releases can be [added here](https://github.com/googleapis/release-please/tree/master/src/releasers) |
+| `release-type` | What type of project is this a release for? Reference [Release types supported](#release-types-supported); new types of releases can be [added here](https://github.com/googleapis/release-please/tree/main/src/strategies) |
 | `package-name` | A name for the artifact releases are being created for (this might be the `name` field in a `setup.py` or `package.json`) |
 | `bump-minor-pre-major` | Should breaking changes before 1.0.0 produce minor bumps?  Default `No` |
 | `bump-patch-for-minor-pre-major` | Should feat changes before 1.0.0 produce patch bumps instead of minor bumps?  Default `No` |