credit elektryk
Update README.md
Introduce 2048: Corruption.

This is a fork of 2048 that introduces corrupted -1 and 1 tiles. These
can combine with any tile, corrupting them into a near-useless tile.

Blank eraser tiles can clear away any time. These can either hurt or
help you.
Merge branch 'master' into gh-pages
Fix the Tweet button and remove the donation buttons.