Add onDispose, move to github

[brianegan]

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@15e1c40). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master       #1   +/-   ##
=========================================
  Coverage          ?   94.44%           
=========================================
  Files             ?        1           
  Lines             ?       54           
  Branches          ?        0           
=========================================
  Hits              ?       51           
  Misses            ?        3           
  Partials          ?        0

Impacted Files	Coverage Δ
lib/flutter_redux.dart	94.44% <100%> (ø)

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