Update README.md

Author: cotejp

README.md

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 Metronome
 =========
 
->WARNING: THIS LIBRARY HAS NOT BEEN TESTED ENOUGH TO BE CONSIDERED PRODUCTION-READY YET (HENCE THE ALPHA VERSION DESIGNATION). USE AT YOUR OWN RISK. MEANWHILE, YOU ARE WELCOME TO SEND ME COMMENTS, SUGGESTIONS AND BUG REPORTS.
+>WARNING: THIS LIBRARY HAS NOT BEEN TESTED ENOUGH TO BE CONSIDERED PRODUCTION-READY YET (HENCE THE BETA VERSION DESIGNATION). USE AT YOUR OWN RISK. MEANWHILE, YOU ARE WELCOME TO SEND ME COMMENTS, SUGGESTIONS AND BUG REPORTS.
 
 ## Description
 **Metronome** is an ActionScript library delivering more accuracy in the scheduling of time-based events than the native Timer object. You can use it as a music metronome or just as a precise way to schedule recurring events.