message: docs: update required Node/npm versions in DEVELOPER.md
diff: @@ -21,9 +21,9 @@ following products on your development machine:
  [Windows](http://windows.github.com)); [GitHub's Guide to Installing
  Git](https://help.github.com/articles/set-up-git) is a good source of information.
  -* [Node.js](http://nodejs.org), (version `>=5.4.1 <6`) which is used to run a development web server,
  +* [Node.js](http://nodejs.org), (version `>=6.9.5 <7.0.0`) which is used to run a development web server,
  run tests, and generate distributable files. We also use Node's Package Manager, `npm`
  - (version `>=3.5.3 <4.0`), which comes with Node. Depending on your system, you can install Node either from
  + (version `>=3.10.7 <4.0.0`), which comes with Node. Depending on your system, you can install Node either from
  source or as a pre-packaged bundle.
  * [Java Development Kit](http://www.oracle.com/technetwork/es/java/javase/downloads/index.html) which is used
  