Update README.md
Remove reference to the old Wiki.
@@ -12,7 +12,6 @@ OpenGL graphics, loading images and videos, and playing sounds and music. *pygle
> The `pyglet-1.5-maintenance` branch is the current stable release. The `master` branch contains the the development code for the upcoming 2.0 release, and may be unstable. **If you want to do a pull request, please target the `pyglet-1.5-maintenance` branch where appropriate**.
* pyglet [documentation]
-* pyglet [wiki]
* pyglet on [PyPI]
* pyglet [discord] server
* pyglet [mailing list]
