Update free-programming-playgrounds.md (#4677)

* Update free-programming-playgrounds.md

* Update free-programming-playgrounds.md
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If-Then-andSometimesElse 4 years ago committed by GitHub
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      free-programming-playgrounds.md

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### Ruby
* [Codepad](http://codepad.org)
* [Sololearn](https://code.sololearn.com/#rb)
* [TryRuby](https://try.ruby-lang.org)

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