iphoneX 适配

[mabaoliang]

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Issue Info

Info	Value
Platform	e.g. ios/osx/tvos
Platform Version	e.g. 8.0
Masonry Version	e.g. 1.0
Integration Method	e.g. carthage/cocoapods/manually

Issue Description

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# 1. Hello!I would like to ask how does masonry make iPhoneX or is there a detailed explanation in your SDK?

[foolsparadise]

support iPhoneX your code just like make.bottom.equalTo(self.view.mas_bottom); repleace as like make.bottom.equalTo(self.view.mas_bottomMargin);