warning: don't use above Node 0.12 (nodejs/node#2835 is the reason)

Author: Mithgol

README.md

@@ -3,6 +3,8 @@
 This package (`echolist-csv2hpt`) is a CLI tool that copies Fidonet echomail area descriptions from a CSV echolist to an HPT areas file.
 
 It requires [Node.js](http://nodejs.org/) to run and [npm](https://www.npmjs.org/) to be installed.
+* Currently only Node.js version 0.10.x or 0.12.x is supported.
+* The latest stable [io.js](https://iojs.org/) or Node v4.0.x are not supported because they are [not backwards-compatible](https://github.com/nodejs/node/issues/2835) with older interfaces currently used by [`iconv-lite`](https://www.npmjs.com/package/iconv-lite).
 
 ## Installing echolist-csv2hpt