Support Swift 5.0 and RxSwift 5.0

[tokijh]

Deprecated

• RxExpect.input(Variable) is deprecated because Variable is deprecated on RxSwift

Noti

I didn't test Carthage and CocoaPods installation. You should test it... I also set the version of RxExpect to 1.3.0. Please check and fix or comment, if you want

[codecov-io]

Codecov Report

Merging #12 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #12   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           4      5    +1     
  Lines          78     78           
=====================================
  Hits           78     78

Impacted Files	Coverage Δ
Sources/RxExpect/AnyTestTime.swift	100% <100%> (ø)	:arrow_up:
Sources/RxExpect/Assertion.swift	100% <100%> (ø)	:arrow_up:
Sources/RxExpect/Deprecated.swift	100% <100%> (ø)
Sources/RxExpect/RxExpect.swift	100% <100%> (ø)	:arrow_up:
Sources/RxExpect/Utility.swift	100% <100%> (ø)	:arrow_up:

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[tokijh]

@devxoul can you check this?