Circle CI Terms and Conditions Update (Docker Layer Caching) Section 11.5

[Joshua-C-Clark]

An update to the terms and conditions of the free version of Circle CI precludes setting docker_layer_caching: true. It will fail the tests on the deployment attempt to Heroku.

Recommend updating the circle ci config.yml code to reflect docker_layer_caching: false to allow forked repositories to step through the deployment.

Thanks for the awesome repository and course!