[ImgBot] Optimize images

[pthariensflame]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example. (inapplicable)
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew tests with your changes locally?

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This was done by ImgBot on my own fork, which I then immediately merged and turned into this manual pull request.
Below is reproduced ImgBot's own message on the content of this PR.

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Beep boop. Your images are optimized!

Your image file size has been reduced!

Details

File	Before	After	Percent reduction
/Library/Homebrew/test/support/fixtures/test.svg	0.26kb	0.25kb	1.52%

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[MikeMcQuaid]

Makes sense, thanks @pthariensflame!