Real time updates

[andre-paraense]

Requirements

• [x] I have added test coverage for new or changed functionality
• [x] I have followed the repository's pull request submission guidelines
• [x] I have validated my changes against all supported platform versions

Related issues

Issue #11

Describe the solution you've provided

I have added support for real time updates for a unique flag.

Describe alternatives you've considered

No alternatives, in this case all we had to do was build platform channels for Android and iOS SDK. Well, we could have done it via REST API calls, but not the direction in this plugin.

Additional context

No other context.

How to test?

Run the example app with your keys and test it.

Future works

Provide access to all feature flags as part of the same issue #11.

[codecov[bot]]

Codecov Report

Merging #12 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #12   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          15     38   +23     
=====================================
+ Hits           15     38   +23

Impacted Files	Coverage Δ
lib/launchdarkly_flutter.dart	100% <100%> (ø)	:arrow_up:

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