Provider sample

[brianegan]

I let the last one go for way too long and bits got outdated. I've updated the sample with the latest code and version of provider.

@rrousselGit would greatly appreciate a review from your side! This is largely a translation of the scoped model app into a Provider app.

Fixes #134

[brianegan]

Thanks for the amazing review, @rrousselGit!

[codecov[bot]]

Codecov Report

Merging #168 into master will decrease coverage by 1.33%. The diff coverage is 55.52%.

@@            Coverage Diff             @@
##           master     #168      +/-   ##
==========================================
- Coverage   68.81%   67.48%   -1.34%     
==========================================
  Files         166      176      +10     
  Lines        3723     4084     +361     
==========================================
+ Hits         2562     2756     +194     
- Misses       1161     1328     +167

Impacted Files	Coverage Δ
mvu/lib/edit/types.dart	100% <ø> (ø)	:arrow_up:
mvu/lib/common/snackbar.dart	16.66% <ø> (+1.28%)	:arrow_up:
change_notifier_provider/lib/edit_todo_screen.dart	0% <0%> (ø)
change_notifier_provider/lib/details_screen.dart	0% <0%> (ø)
mvu/lib/edit/types.g.dart	48.93% <100%> (ø)	:arrow_up:
built_redux/lib/models/serializers.g.dart	100% <100%> (ø)	:arrow_up:
...repository_simple/lib/src/reactive_repository.dart	96.29% <100%> (ø)	:arrow_up:
...tifier_provider/lib/home/extra_actions_button.dart	21.05% <21.05%> (ø)
built_redux/lib/models/app_tab.g.dart	70% <33.33%> (ø)	:arrow_up:
...ange_notifier_provider/lib/home/filter_button.dart	34.37% <34.37%> (ø)
... and 21 more

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