Log Message:
devel/ruby-cucumber-core: update to 4.0.0

## [4.0.0](https://github.com/cucumber/cucumber-ruby-core/compare/v3.2.0...v4.0.0)

### Changed

* Update to use Gherkin v6
  ([#158](https://github.com/cucumber/cucumber-ruby-core/pull/158)
  @brasmusson)
* Let Scenarios with no Steps get the result status Undefined
  ([#157](https://github.com/cucumber/cucumber-ruby-core/pull/157)
  @brasmusson)
* Convert to use the Gherkin compiler and Pickles
  ([#156](https://github.com/cucumber/cucumber-ruby-core/pull/156)
  @brasmusson)

### Added

* N/A

### Fixed

* N/A

### Removed

* Remove the support for old style tag expressions
  ([#159](https://github.com/cucumber/cucumber-ruby-core/pull/159)
  @brasmusson)