Thanks for submitting a pull request! Please provide enough information so that others can review your pull request:
(You can skip this if you're fixing a typo or adding an app to the Showcase.)
Explain the motivation for making this change. What existing problem does the pull request solve?
Example: When "Adding a function to do X", explain why it is necessary to have a way to do X.
Test plan (required)
Demonstrate the code is solid. Example: The exact commands you ran and their output, screenshots / videos if the pull request changes UI.
Make sure tests pass on both Travis and Circle CI.
Code formatting
See the simple style guide.