Changed the appveyor config to use the VS2017 RC as per comment https://github.com/cucumber/gherkin/pull/215#issuecomment-280116673
Changed the appveyor config to use the VS2017 RC as per comment https://github.com/cucumber/gherkin/pull/215#issuecomment-280116673

cucumber/gherkin3,cucumber/gherkin3,cucumber/gherkin3,cucumber/gherkin3,cucumber/gherkin3,cucumber/gherkin3,cucumber/gherkin3,cucumber/gherkin3,cucumber/gherkin3