Migrate to Swift 4.2

[murselturk]

#4

[codecov-io]

Codecov Report

Merging #5 into master will increase coverage by 0.63%. The diff coverage is 98.26%.

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
+ Coverage   96.79%   97.42%   +0.63%     
==========================================
  Files          11       11              
  Lines         406      350      -56     
==========================================
- Hits          393      341      -52     
+ Misses         13        9       -4

Impacted Files	Coverage Δ
Sources/RxReusable/UIView+Utils.swift	100% <ø> (ø)
Sources/RxReusable/Driver+RxReusable.swift	0% <0%> (ø)
...urces/RxReusable/UICollectionView+RxReusable.swift	100% <100%> (ø)
Tests/RxReusableTests/DisplayingTests.swift	100% <100%> (ø)	:arrow_up:
Sources/RxReusable/NSObject+RxReusable.swift	92.85% <100%> (ø)
...ources/RxReusable/UITableViewCell+RxReusable.swift	100% <100%> (ø)
Sources/RxReusable/RxReusableType.swift	92.3% <100%> (ø)
...s/RxReusable/UICollectionViewCell+RxReusable.swift	100% <100%> (ø)
Sources/RxReusable/UITableView+RxReusable.swift	100% <100%> (ø)
Sources/RxReusable/Observable+RxReusable.swift	100% <100%> (ø)
... and 3 more

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