Add notice about uglifyjs issues

Closes #27. Unfortunately uglifyjs does not support ES6 in the master branch.
ericnorris · Mar 10, 2017 · 7179485 · 7179485
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 # striptags [![Build Status](https://travis-ci.org/ericnorris/striptags.svg)](https://travis-ci.org/ericnorris/striptags)
 An implementation of PHP's [strip_tags](http://www.php.net/manual/en/function.strip-tags.php) in Node.js.
 
+**Note:** `v3+` targets ES6, and is therefore incompatible with the maaster branch of `uglifyjs`. You can either:
+- use `babili`, which supports ES6
+- use the `harmony` branch of `uglifyjs`
+- stick with the [2.x.x](https://github.com/ericnorris/striptags/tree/v2.x.x) branch
+
 ## Features
 - Fast
 - Zero dependencies