v0.8.2

Add

• Add heightForHeader and heightForFooter in Protocols
• Do not need to set frame height when set up header&footer&left&right

Updated

• Rename didBeginEndRefershingAnimation to didBeginHideRefershingAnimation
• Rename didCompleteEndRefershingAnimation to didCompleteHideRefershingAnimation
• Rename durationWhenEndRefreshing to durationOfHideAnimation

Fixd

• Fix footer frame issue