remove lita (website down)

- ref. https://github.com/awesome-foss/awesome-sysadmin/issues/405

README.md

@@ -141,7 +141,6 @@
 - [Eggdrop](http://www.eggheads.org/) - The oldest Internet Relay Chat (IRC) bot still in active development. ([Source Code](https://github.com/eggheads/eggdrop)) `GPL-2.0` `C`
 - [Errbot](http://errbot.io/) - a plugin based chatbot designed to be easily deployable, extensible and maintainable. ([Source Code](https://github.com/errbotio/errbot)) `GPL-3.0` `Python`
 - [Hubot](https://hubot.github.com/) - A customizable, life embetterment robot. ([Source Code](https://github.com/hubotio/hubot)) `MIT` `Nodejs`
-- [Lita](https://www.lita.io/) - A robot companion for your company's chat room.
 
 
 ### Client management