[Travis] Multiple Xcodes including Xcode 9 and iPhone X

[willlarche]

No description provided.

[chuga]

[codecov-io]

Codecov Report

Merging #2084 into develop will increase coverage by 3.46%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2084      +/-   ##
===========================================
+ Coverage    43.29%   46.75%   +3.46%     
===========================================
  Files          206      208       +2     
  Lines        17847    21557    +3710     
  Branches      1815     1831      +16     
===========================================
+ Hits          7726    10080    +2354     
- Misses        9515    11464    +1949     
+ Partials       606       13     -593

Impacted Files	Coverage Δ
components/private/Math/src/MDCMath.h	78.31% <0%> (-21.69%)	⬇️
components/private/RTL/src/UIView+MaterialRTL.m	54.79% <0%> (-16.95%)	⬇️
components/private/RTL/src/UIImage+MaterialRTL.m	32.6% <0%> (-11.66%)	⬇️
...ents/private/ThumbTrack/src/MDCNumericValueLabel.m	35% <0%> (-10.29%)	⬇️
...ing/src/CAMediaTimingFunction+MDCAnimationTiming.m	36.36% <0%> (-6.5%)	⬇️
...s/private/KeyboardWatcher/src/MDCKeyboardWatcher.m	20.86% <0%> (-4.14%)	⬇️
...ts/CollectionCells/src/MDCCollectionViewTextCell.m	38.92% <0%> (-1.68%)	⬇️
components/private/Icons/src/MDCIcons.m	72.22% <0%> (-1.12%)	⬇️
...Collections/src/private/MDCCollectionInfoBarView.m	18.36% <0%> (-0.9%)	⬇️
components/private/RTL/src/MDCRTL.m	52.63% <0%> (-0.71%)	⬇️
... and 117 more

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