1.3.0

• update API version to 2.9
• add API for Thread (#54)
• add API for Tag (#46)
• add support for tags inside Send API (#46)
• add callback for Policy Enforcement (#59)
• add callback for App Roles (#60)
• add callback for Standby (#61)
• fix issue #50 (Thanks to @Khodl)
• rename namespace Kerox\Messenger\Common\Buttons to Kerox\Messenger\Common\Button
• remove classes ThreadSettings and all classes inside namespace Kerox\Messenger\Model\ThreadSettings
• remove methods sendMessage() and sendAction() from Send API
• remove method getProfile() from User API
• remove methods sendSubscribe() and getChalleng() from Webhook API
• update README
• update tests