Added no longer maintained message

README.md

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 ## The JavaScript Database
 
+> :warning: :warning: :warning: **WARNING:** this library is no longer maintained, and may have bugs and security issues. Feel free to fork but no pull request or security alert will be answered.
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 **Embedded persistent or in memory database for Node.js, nw.js, Electron and browsers, 100% JavaScript, no binary dependency**. API is a subset of MongoDB's and it's <a href="#speed">plenty fast</a>.
 
 **IMPORTANT NOTE**: Please don't submit issues for questions regarding your code. Only actual bugs or feature requests will be answered, all others will be closed without comment. Also, please follow the <a href="#bug-reporting-guidelines">bug reporting guidelines</a> and check the <a href="https://github.com/louischatriot/nedb/wiki/Change-log" target="_blank">change log</a> before submitting an already fixed bug :)