Update README documentation with 0.6.0 notice.
Update README documentation with 0.6.0 notice.

kuujo/copycat,tempbottle/copycat,arnonmoscona/copycat,arnonmoscona/copycat,kuujo/copycat,madjam/copycat,madjam/copycat,atomix/atomix,aruanruan/copycat,atomix/atomix,aruanruan/copycat,tempbottle/copycat