Update link to 1.5 migration guide in readme
@@ -10,7 +10,7 @@ OpenGL graphics, loading images and videos, and playing sounds and music. *pygle
> :exclamation: :exclamation: A major pyglet update has just been released (v2.0). This brings many
> new exciting features, but also some necessary breaking changes. If your game/application has suddenly
-> stopped working, please read the [migration section in the documentation](https://pyglet.readthedocs.io/en/master/programming_guide/migration.html)
+> stopped working, please read the [migration section in the documentation](https://pyglet.readthedocs.io/en/latest/programming_guide/migration.html)
> The previous version of pyglet is tracked in the `pyglet-1.5-maintenance` branch.
> **If you want to do a pull request for the previous release, please target the appropriate branch**.
