Merge branch 'master' of https://github.com/xhzengAIB/MessageDisplayKit

Update MessageDisplayKit.pdspec file 3.0.2

Update MessageDisplayKit.pdspec file 3.0.1

Merge branch 'RefactorBranch'

update MessageDisplayKit.podspec 0.2.9

update MessageDisplayKit.podspec 0.2.8

update MessageDisplayKit.podspec v0.2.7

update MessageDisplayKit.podspec v0.2.6

update MessageDisplayKit.podspec v0.2.5

update MessageDisplayKit.podspec v0.2.4