Update README about deprecation

README.md

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+## Unmaintained
+
+The Twitter social environment is a bit different than it was when I originally wrote this, and Twitter has [deprecated the streaming API](https://developer.twitter.com/en/docs/accounts-and-users/subscribe-account-activity/api-reference/user-stream) on which the ebooks bots depend. I've moved on to other projects, but feel free to fork!
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 # twitter\_ebooks
 
 [![Gem Version](https://badge.fury.io/rb/twitter_ebooks.svg)](http://badge.fury.io/rb/twitter_ebooks)
 [![Build Status](https://travis-ci.org/mispy/twitter_ebooks.svg)](https://travis-ci.org/mispy/twitter_ebooks)
-[![Dependency Status](https://gemnasium.com/mispy/twitter_ebooks.svg)](https://gemnasium.com/mispy/twitter_ebooks)
 
 A framework for building interactive twitterbots which respond to mentions/DMs. See [ebooks_example](https://github.com/mispy/ebooks_example) for a fully-fledged bot definition.