Migration to RxJava3

[KeithYokoma]

Migration Note: https://github.com/ReactiveX/RxJava/wiki/What's-different-in-3.0

[hirak]

Codecov Report

Merging #29 into master will not change coverage by %. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #29   +/-   ##
=========================================
  Coverage     98.18%   98.18%           
  Complexity        8        8           
=========================================
  Files             7        7           
  Lines           330      330           
  Branches         14       14           
=========================================
  Hits            324      324           
  Misses            1        1           
  Partials          5        5           

---

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[codecov-io]

Codecov Report

Merging #29 into master will not change coverage. The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #29   +/-   ##
=========================================
  Coverage     98.18%   98.18%           
  Complexity        8        8           
=========================================
  Files             7        7           
  Lines           330      330           
  Branches         14       14           
=========================================
  Hits            324      324           
  Misses            1        1           
  Partials          5        5

Impacted Files	Coverage Δ	Complexity Δ
...c/test/java/com/mercari/rxredux/MultiThreadTest.kt	94.87% <ø> (ø)	2 <0> (ø)	:arrow_down:
...redux/src/main/java/com/mercari/rxredux/RxRedux.kt	96.55% <ø> (ø)	0 <0> (ø)	:arrow_down:
...x/src/test/java/com/mercari/rxredux/RxReduxTest.kt	99.44% <100%> (ø)	0 <0> (ø)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 7cbd11b...887f8e6. Read the comment docs.

[kittinunf]

Looks golden to me!

Btw, on the side note since the introduction of DisposableContainer or CompositeDisposable, I think we should improve this API surface

override fun dispatch(vararg actions: Observable<out A>): List<Disposable>

to

override fun dispatch(vararg actions: Observable<out A>): [DisposableContainer | CompositeDisposable]

Since we are about to update this into the new version (I think it has been battle-tested in Merpay long enough to promote RxRedux to version 1.0.0), I might be a good time to rethink the API surface a bit.