Add PR number for drawText removal changelog entry

Author: mokagio

CHANGELOG.md

@@ -24,7 +24,7 @@ _None_
 
 ### Breaking Changes
 
-* Removes the `drawText` binary from the gem (instead depending on it being installed via `brew`). Because this update can not be safely applied with no side effects, it's considered a breaking change.
+* Removes the `drawText` binary from the gem (instead depending on it being installed via `brew`). Because this update can not be safely applied with no side effects, it's considered a breaking change. [#312]
 
 ### New Features