v2.2.6

• Updated chat SDK minor version to v3.1.7
• Added new classes to support limited photo access level.
  • Added SBUSelectablePhotoViewController class.
  • Added SBUPhotoCollectionViewCell class.
  • Added SBUPhotoAccessLevel and SBUPhotoAccessibleStatus.
• Added rootViewController parameter in moveToChannel function on SBUMain class and changed access level.
• Added dismissAndMoveToChannel function on SBUCreateChannelViewController.
• Improved stabilities