Update 'README.md'

README.md

@@ -5,6 +5,7 @@
 [![Gem Version](https://badge.fury.io/rb/namarara.svg)](https://rubygems.org/gems/namarara)
 [![GitHub license](https://img.shields.io/github/license/glenux/namarara.svg)](https://github.com/glenux/namarara/blob/master/LICENSE)
 [![Donate on patreon](https://img.shields.io/badge/patreon-donate-orange.svg)](https://patreon.com/glenux)
+[![Please don't upload to GitHub](https://nogithub.codeberg.page/badge.svg)](https://nogithub.codeberg.page)
 
 Namarara is a library that can parses boolean expressions, builds an [binary
 expression tree](https://en.wikipedia.org/wiki/Binary_expression_tree) and