Support for Gherkin 6

[cicinsain]

Gherkin 6 provides a new set of reserved words like Rule, Example... aligned with BDD Example Mapping technique. Ti would be useful to add Gherkin 6 support in Pickles.

[ericcmmi]

I am currently working on the dotnet core (Standard 2.0) release of Pickles which also required upgrading the Gherkin library to version 6. I have not started to implement the new features yet but once this new version is released I can start pursuing that.

[s1m0nj]

Yes I would love support for Rule, Example as well.