Typo in CONTRIBUTING.md?

Hey, I was looking to contribute and  going through [CONTRIBUTING.md](https://github.com/brean/python-pathfinding/blob/d1b6b42f7984436391cc6e72f72225312bc67feb/CONTRIBUTING.md), and noticed that under the [Pull Requests](https://github.com/brean/python-pathfinding/blob/d1b6b42f7984436391cc6e72f72225312bc67feb/CONTRIBUTING.md#pull-requests) section it says Gitlab instead of Github.