prepare for v0.2.3

[hoc081098]

No description provided.

[codecov]

Codecov Report

Merging #65 (f823329) into master (3fbbc90) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head f823329 differs from pull request most recent head 59eefda. Consider uploading reports for the commit 59eefda to get more accurate results

@@            Coverage Diff             @@
##           master      #65      +/-   ##
==========================================
- Coverage   96.07%   96.06%   -0.02%     
==========================================
  Files          43       43              
  Lines         765      763       -2     
==========================================
- Hits          735      733       -2     
  Misses         30       30              

Impacted Files	Coverage Δ
lib/src/operators/to_single_subscription.dart	100.00% <ø> (ø)
lib/src/state_stream/as_broadcast.dart	100.00% <ø> (ø)

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