Fix typo (#258)
Fix typo (#258)

Fix a typo in the Readme.txt
Aurioch/MonoGame.Extended,LithiumToast/MonoGame.Extended,rafaelalmeidatk/MonoGame.Extended,cra0zy/MonoGame.Extended,rafaelalmeidatk/MonoGame.Extended,HyperionMT/MonoGame.Extended