This service starts a preview of your book on Leanpub whenever a push is made to your repository.

Required values are:

api_key: Your Leanpub api_key, which you can find at https://leanpub.com/dashboard/account.

slug: The slug for your book. This is the part of the URL for your book after https://leanpub.com/. For example, for https://leanpub.com/thes3cookbook, the slug is thes3cookbook.

See https://leanpub.com/help/api for more information on the Leanpub API.
