Update free-programming-playgrounds.md (#3526)

* Update free-programming-playgrounds.md

Added codesandbox.io under React (and removed the react reference from its listing on JavaScript).
Added a Java section and linked to repl.it
repl.it actually has sandboxes for most of the languages listed here, and maybe some others, but I didn't add them all in. The Swing support for Java is new, and has some bugs. They didn't respond to my report, so I think they are spread a little thin.

* add spaces to satisfy linter

* add space to satisfy linter

Co-authored-by: Eric Hellman <eric@hellman.net>
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Nat Kuhn 2020-02-20 13:56:35 -05:00 committed by GitHub
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@ -9,6 +9,7 @@
* [Go](#go)
* [Haskell](#haskell)
* [Ionic](#ionic)
* [Java](#java)
* [JavaScript](#javascript)
* [Kotlin](#kotlin)
* [.Net](#dotnet)
@ -77,10 +78,15 @@
* [StackBlitz](https://stackblitz.com/fork/ionic)
### Java
* [repl.it](https://repl.it) (_including a separate Java/Swing_)
### JavaScript
* [CodePen](https://codepen.io)
* [CodeSandbox.io](https://codesandbox.io) (_React_)
* [CodeSandbox.io](https://codesandbox.io)
* [JSBin](http://jsbin.com)
* [JSFiddle](http://jsfiddle.net)
* [Plunker](http://plnkr.co)
@ -132,6 +138,7 @@
### React
* [CodeSandbox.io](https://codesandbox.io)
* [StackBlitz](https://stackblitz.com/fork/react)
@ -177,3 +184,4 @@
* [Playground](https://www.typescriptlang.org/play/index.html)
* [StackBlitz](https://stackblitz.com/fork/typescript)