Typo correction

This might be a matter of personal taste, but as a native English speaker (albeit a Scottish one) the flow of this sentence doesn't work. Reward you / damage you. In game terminology, maybe it makes sense, but in life terminology, it doesn't. You won't damage me unless you hack my email, kill my cat, or whatever. Reward / penalize are more usual antonyms.
Merge pull request #147 from chmac/patch-1

Typo correction