Support windows

[wasabeef]

What does this change?

• Not working properly in Windows #25 Support Windows.

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

• Pass CI on Windows.

[codecov]

Codecov Report

Merging #28 into main will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
+ Coverage   95.54%   95.59%   +0.04%     
==========================================
  Files          15       15              
  Lines         359      363       +4     
==========================================
+ Hits          343      347       +4     
  Misses         16       16              

Impacted Files	Coverage Δ
lib/flutter_generator.dart	70.45% <100.00%> (+2.16%)	⬆️
lib/src/generators/assets_generator.dart	100.00% <100.00%> (ø)
lib/src/generators/generator_helper.dart	100.00% <100.00%> (ø)
lib/src/settings/flutter_gen.dart	95.45% <100.00%> (ø)
lib/src/utils/camel_case.dart	100.00% <100.00%> (ø)

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