Remove Twitter badge from README.md.

Related commit in farmOS: farmOS/farmOS@8c816e8

README.md

@@ -2,7 +2,6 @@
 
 [![Licence](https://img.shields.io/badge/Licence-GPL%203.0-blue.svg)](https://opensource.org/licenses/GPL-3.0/)
 [![Last commit](https://img.shields.io/github/last-commit/farmOS/farmOS.js.svg?style=flat)](https://github.com/farmOS/farmOS-client/commits)
-[![Twitter](https://img.shields.io/twitter/follow/farmOSorg.svg?label=%40farmOSorg&style=flat)](https://twitter.com/farmOSorg)
 [![Chat](https://img.shields.io/matrix/farmOS:matrix.org.svg)](https://riot.im/app/#/room/#farmOS:matrix.org)
 [![npm](https://img.shields.io/npm/v/farmos.svg)](https://www.npmjs.com/package/farmos)