Update minecraft.svg

old one, too much blured!
![minecraft](https://cloud.githubusercontent.com/assets/5593818/5409989/128758b8-81e8-11e4-9cb2-875e6a8b52ca.png)


![screenshot from 2014-12-12 10 05 36](https://cloud.githubusercontent.com/assets/5593818/5409952/83c98416-81e7-11e4-861a-57607430ca0d.png)