README: make mayLaunchUrl accept the Uri
README: make mayLaunchUrl accept the Uri

and correct the onServiceDisconnected() parameters

Change-Id: I459cdea0db5c14e86e38553c0ce920273678f089

ZaneSummer/custom-tabs-client,ardock/custom-tabs-client,GoogleChrome/custom-tabs-client,andreban/custom-tabs-client,smartnsoft/custom-tabs-client