readme: remove tracking from Gitter URL
@@ -152,7 +152,7 @@ better result.
Take a look at [CONTRIBUTING.md](CONTRIBUTING.md) for further information.
For any kind of discussion, feel free to use our
-[Gitter](https://gitter.im/pixellib/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[Gitter](https://gitter.im/pixellib/Lobby)
community.
## License
