Fix issue with dashes in definitions

[Vovanella95]

Closed #99

[codecov]

Codecov Report

Merging #100 (0df02c0) into master (d70e79a) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #100   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          510       517    +7     
=========================================
+ Hits           510       517    +7     

Impacted Files	Coverage Δ
...c/code_generators/swagger_converter_generator.dart	100.00% <100.00%> (ø)
...b/src/code_generators/swagger_enums_generator.dart	100.00% <100.00%> (ø)
...rc/code_generators/swagger_requests_generator.dart	100.00% <100.00%> (ø)

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