Bug fix on AMAZON.RepeatIntent of Cookbook labs Recipe
Bug fix on AMAZON.RepeatIntent of Cookbook labs Recipe

Since 'AMAZON.NextIntent' will do `incrementStep.call(this, 1);` every time it handles request, when there is no `this.attributes['currentStep']` stored, we probably should start with 0, rather than 1.
SleepyDeveloper/alexa-cookbook,SleepyDeveloper/alexa-cookbook