Add link for removed method

README.md

@@ -422,13 +422,14 @@ construction currently used throughout the client.
 
 Version 4.0
 
-- **removes support for a [long deprecated overload][list_pulls] for
+- **removes support for a [long deprecated overload][list-pulls] for
 passing state as a positional argument** when listing pull requests. Instead,
 pass `state` in the method options.
 - **drops support for Ruby < 2.0**.
 - adds support for new [Enterprise-only APIs](#working-with-github-enterprise).
 - adds support for [Repository redirects][redirects].
 
+[list-pulls]: https://github.com/octokit/octokit.rb/commit/e48e91f736d5fce51e3bf74d7c9022aaa52f5c5c 
 [redirects]: https://developer.github.com/changes/2015-05-26-repository-redirects-are-coming/
 
 Version 3.0 includes a couple breaking changes when upgrading from v2.x.x: