Change linter to effective_dart

[wasabeef]

What does this change?

• Change linter to effective_dart

What is the value of this and can you measure success?

• More Effective Dart

[codecov]

Codecov Report

Merging #32 into main will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   95.59%   95.61%   +0.02%     
==========================================
  Files          15       15              
  Lines         363      365       +2     
==========================================
+ Hits          347      349       +2     
  Misses         16       16              

Impacted Files	Coverage Δ
lib/src/generators/assets_generator.dart	100.00% <ø> (ø)
lib/src/generators/colors_generator.dart	95.45% <ø> (ø)
lib/src/generators/fonts_generator.dart	100.00% <ø> (ø)
...b/src/generators/integrations/svg_integration.dart	100.00% <ø> (ø)
lib/src/settings/flutter.dart	100.00% <ø> (ø)
lib/flutter_generator.dart	70.45% <100.00%> (ø)
lib/src/settings/config.dart	100.00% <100.00%> (ø)
lib/src/settings/flutter_gen.dart	95.45% <100.00%> (ø)
lib/src/utils/color.dart	100.00% <100.00%> (ø)

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