add dependency details to readme [skip ci]

README.md

 Asynchronous, non-blocking [SQLite3](http://sqlite.org/) bindings for [Node.js](http://nodejs.org/).
 
 [![NPM](https://nodei.co/npm/sqlite3.png?downloads=true&downloadRank=true)](https://nodei.co/npm/sqlite3/)
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 [![Build Status](https://travis-ci.org/mapbox/node-sqlite3.svg?branch=master)](https://travis-ci.org/mapbox/node-sqlite3)
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 [![Build status](https://ci.appveyor.com/api/projects/status/gvm7ul0hpmdawqom)](https://ci.appveyor.com/project/Mapbox/node-sqlite3)
+[![Dependencies](https://david-dm.org/mapbox/node-sqlite3.svg)](https://david-dm.org/mapbox/node-sqlite3)
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 ## Supported platforms