Replace to `AnyTestTime.next` from `next`

[tokijh]

This PR contains #12

Deprecated

next is deprecated. Please use AnyTestTime.next

[codecov-io]

Codecov Report

Merging #13 into master will decrease coverage by 2.5%. The diff coverage is 90.47%.

@@           Coverage Diff            @@
##           master     #13     +/-   ##
========================================
- Coverage     100%   97.5%   -2.5%     
========================================
  Files           4       5      +1     
  Lines          78      80      +2     
========================================
  Hits           78      78             
- Misses          0       2      +2

Impacted Files	Coverage Δ
Sources/RxExpect/AnyTestTime.swift	100% <100%> (ø)	:arrow_up:
Sources/RxExpect/Assertion.swift	100% <100%> (ø)	:arrow_up:
Sources/RxExpect/RxExpect.swift	100% <100%> (ø)	:arrow_up:
Sources/RxExpect/Utility.swift	100% <100%> (ø)	:arrow_up:
Sources/RxExpect/Deprecated.swift	80% <80%> (ø)

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