Why Pagespeed methods require an API key now?

Since version 2.5.2, SEOstats requires an API key for the methods Google::getPagespeedAnalysis() and Google::getPagespeedScore(). I'm sorry for the inconvenience, but Google (or more correctly the guy who (also) leads the Pagespeed Service) asked me to change the Pagespeed implementation to use the official API, rather than how it was done before. And I won't f*** with Google. ;-)