Update README.md

Author: kegsay

README.md

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 This is a fork of [node-irc](http://node-irc.readthedocs.org/), which is an IRC client library written in [JavaScript](http://en.wikipedia.org/wiki/JavaScript) for [Node](http://nodejs.org/). This fork is used by the [Matrix-IRC application service](http://github.com/matrix-org/matrix-appservice-irc).
 
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 You can access more detailed documentation for this module at [Read the Docs](http://readthedocs.org/docs/node-irc/en/latest/)
 
+# Differences from `node-irc`
+The `node-irc` library isn't well maintained and there are a number of issues which are impacting development of the [Matrix-IRC application service](http://github.com/matrix-org/matrix-appservice-irc). We made the decision to fork the project in order to improve reliability of the application service. A summary of modifications from `node-irc@0.3.12` are below:
+ - https://github.com/martynsmith/node-irc/pull/386 - Manifested as [BOTS-80](https://matrix.org/jira/browse/BOTS-80)