Step 7 has a lot of extraneous lines in diff

[amyschoen]

Bug Report

Current behavior
I'm seeing a lot of extra lines come up in the diff due to spacing differences in engine.js and game.js.

Reproduction
Steps to reproduce the behavior in the course:

1. Take the course until you get to step 7.
2. Take a look at the diff for the review.
3. You'll see a lot of extra lines flagged in the diff due to a space or lack thereof.

Expected behavior
I would expect the diff to show the new file (.github/release-drafter.yml) and only the changes to make the text green.

Possible solution
Clean up the files on the green-colors branch.

Additional context
GHES v2.19.6, LL v0.6.0

/cc @crichID @brianamarie @hectorsector @JasonEtco