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

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* Update free-programming-playgrounds.md
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@ -194,6 +194,7 @@
### Ruby
* [Codepad](http://codepad.org)
* [Sololearn](https://code.sololearn.com/#rb)
* [TryRuby](https://try.ruby-lang.org)