V4.0.0

[rrousselGit]

closes #237, closes #236, closes #259, closes #81, closes #276, closes #213

[codecov-io]

Codecov Report

Merging #243 into master will increase coverage by 0.07%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #243      +/-   ##
==========================================
+ Coverage   99.36%   99.43%   +0.07%     
==========================================
  Files          10       10              
  Lines         627      714      +87     
==========================================
+ Hits          623      710      +87     
  Misses          4        4

Impacted Files	Coverage Δ
packages/provider/lib/src/selector.dart	100% <ø> (ø)	⬆️
packages/provider/lib/src/consumer.dart	100% <ø> (ø)	⬆️
packages/provider/lib/src/async_provider.dart	100% <100%> (ø)	⬆️
packages/provider/lib/src/inherited_provider.dart	100% <100%> (ø)
...es/provider/lib/src/value_listenable_provider.dart	100% <100%> (ø)	⬆️
packages/provider/example/lib/main.dart	91.11% <100%> (ø)	⬆️
...ges/provider/lib/src/change_notifier_provider.dart	100% <100%> (ø)	⬆️
packages/provider/lib/src/provider.dart	100% <100%> (ø)	⬆️
packages/provider/lib/src/listenable_provider.dart	100% <100%> (ø)	⬆️
packages/provider/lib/src/proxy_provider.dart	100% <100%> (ø)	⬆️
... and 7 more

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