Update CONTRIBUTING.md (#9382)
This will hopefully prevent other people making the same mistake as me (https://github.com/mrdoob/three.js/pull/9381#issuecomment-234625456)
R
Rich Harris committed
c3656ca1113ed69a04166e546ccc5781a5ec3537
Parent: 4f98d35
Committed by Mr.doob <info@mrdoob.com>
on 7/22/2016, 9:47:10 PM