[MOB-153] - Update to Swift 4.2

[tapashmajumder]

No description provided.

[codecov-io]

Codecov Report

Merging #45 into stable will decrease coverage by 0.09%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           stable      #45     +/-   ##
=========================================
- Coverage   90.51%   90.42%   -0.1%     
=========================================
  Files          26       26             
  Lines        1097     1097             
=========================================
- Hits          993      992      -1     
- Misses        104      105      +1

Impacted Files	Coverage Δ
swift-sdk/Internal/IterableAPIInternal.swift	89.58% <ø> (-0.42%)	⬇️
...-sdk/Internal/IterableAppIntegrationInternal.swift	88.88% <ø> (ø)	⬆️
swift-sdk/IterableAPI.swift	98.41% <ø> (ø)	⬆️
...sdk/Internal/IterableInAppHTMLViewController.swift	92.45% <100%> (ø)	⬆️

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[vbabenkoru]

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