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(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?
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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
Look around. Match the style of the rest of the codebase. See also the simple style guide.
For more info, see the "Pull Requests" section of our "Contributing" guidelines.