Add StateStream

[hoc081098]

No description provided.

[codecov]

Codecov Report

Merging #27 (6d018bb) into master (48ae358) will increase coverage by 0.39%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   93.60%   94.00%   +0.39%     
==========================================
  Files          32       35       +3     
  Lines         469      500      +31     
==========================================
+ Hits          439      470      +31     
  Misses         30       30              

Impacted Files	Coverage Δ
lib/src/default_sink.dart	80.00% <ø> (ø)
...ue_stream/not_replay_value_connectable_stream.dart	97.29% <ø> (ø)
...ay_value_stream/not_replay_value_stream_mixin.dart	80.00% <ø> (ø)
lib/src/not_replay_value_stream/stream_event.dart	100.00% <ø> (ø)
...t_replay_value_stream/value_stream_controller.dart	100.00% <ø> (ø)
lib/src/not_replay_value_stream/value_subject.dart	100.00% <ø> (ø)
lib/src/single/api_contract_violation_error.dart	33.33% <ø> (ø)
lib/src/single/rx_singles.dart	91.66% <ø> (ø)
lib/src/single/single.dart	100.00% <ø> (ø)
lib/src/single/single_or_error.dart	50.00% <ø> (ø)
... and 9 more

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