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Merge branches 'master' and 'master' of https://github.com/easemob/sdkexamples-ios

# By winterSleep
# Via winterSleep
* 'master' of https://github.com/easemob/sdkexamples-ios:
  整理 errortype

# By winterSleep
# Via winterSleep
* 'master' of https://github.com/easemob/sdkexamples-ios:
  整理 errortype