键盘按下时没有释放事件

[kevinypcao]

不能注册键盘释放事件

[Li, Xizhi]

added key release event handler. git pull from package/main

function EditContext:keyReleaseEvent(event)
	EditContext._super.keyReleaseEvent(self, event);
	if(event:isAccepted()) then
		return
	end
end