slightly pedantic fix for plural

Since the intent is a plurality of APIs, rather than a possessive expression (like "I've rewritten my API's code in the latest release") there's no need for apostrophes.  I realize some people use apostrophes any time 's' follows a capital letter ("FAQ's", "my CD's", etc.) but I think that's not ideal.  

Obviously it's finally up to you.  I'm just hoping to make a tiny contribution to your awesome project.