Add arguments to repeatString README about javascript-exercises HOT 6 CLOSED

I can do this one. Do I need to comment further or should I just go ahead and do it? Thanks!

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@msespos Go ahead, thank you :)

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As I'm doing this, I'm noticing that the bullet points at the bottom of the README are somewhat confusing. It looks like there is an "If..." statement with no "then" followup. My proposed edit is below. Should I include it with this edit or make a separate PR? I'm guessing a separate PR.

Proposed edit:

If running npm test repeatString.spec.js returns results similar to the below, make sure you have enabled the rest of the tests, as described in the instructions above.
 Test Suites: 1 passed, 1 total
 Tests:       6 skipped, 1 passed, 7 total

What do you think?

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It can be the same PR, it's just moving an existing bullet

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OK thanks!

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OK both are done and on the same PR. This is my first PR in response to an open issue (all others have been my own suggestions), so let me know if I need to do anything else on my end or if I'm done, please! Thanks! :)

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