fix: remove bracket on gherkin generator

[golane-august]

The generator is currently not working, as the bracket was not removed in my proposes from here:
#279 (comment)

CC @AFASbart

[rhalff]

@jonsamwell this PR still needs to merge, generating the files will give a formatter parse error otherwise. It's due to some previous commits fiddling within that area.

[AFASbart]

I have it approved, @jonsamwell needs to approve it aswell and then create a new version. For the time being you can work with your own branch version:

  flutter_gherkin:
    git:
      url: https://github.com/golane-august/flutter_gherkin.git
      ref: fix/remove-bracket-generator

[julianryorex]

What is the ETA on this?