Add rake tmp:cache:clear to Makefile

[icarito]

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• tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR -- or run tests locally with rake test
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• PR body includes fixes #0000-style reference to original issue #
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Thanks!

[plotsbot]

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📖	@icarito Thank you for your pull request! I’m here to help with some tips and recommendations. Please take a look at the list provided and help us review and accept your contribution! And don’t be discouraged if you see errors – we’re here to help.
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