Add link to Gitter channel
* Get involved:
* [Raise a bug / request an enhancement](https://github.com/potentialventures/cocotb/issues/new) (Requires a GitHub account)
* [Join the mailing list](https://lists.librecores.org/listinfo/cocotb)
+ * [Join the Gitter chat room](https://gitter.im/cocotb)
* Get in contact: [E-mail us](mailto:cocotb@potentialventures.com)
* Follow us on twitter: [@PVCocotb](https://twitter.com/PVCocotb)
