Complete the Hacktoberfest Challenge 4 - PR

The Hacktoberfest is an annual event by github and digital ocean VPS that sponsor a T-shirt if you have 4 PR merged in October.

This year, many spam the github repros. However, there are still some good PRs. You can submit PR to your own repros as long as it is labeled "hacktoberfest" or "hacktoberfest-2020"

Anyway, I am glad that I finish the 4 PRs - actually I submitted more and 8 of them are merged.

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