Merge branch 'master' of https://github.com/Chalarangelo/30-seconds-of-code

CONTRIBUTING.md

@@ -25,6 +25,7 @@ Here's what you can do to help:
 - **Snippet code** must be enclosed inside ` ```js ` and ` ``` `.
   - Remember to start your snippet's code on a new line below the opening backticks.
   - Use ES6 notation to define your function. For example `const myFunction = ( arg1, arg2 ) => { }`.
+  - Please use Javacript [Semi-Standard Style](https://github.com/Flet/semistandard).
   - Try to keep your snippets' code short and to the point. Use modern techniques and features. Make sure to test your code before submitting.
   - All snippets must be followed by one (more if necessary) test case after the code, on a new line, in the form of a comment, along with the expected output. The syntax for this is `myFunction('testInput') -> 'testOutput'`. Use multiline comments only if necessary.
   - Try to make your function name unique, so that it does not conflict with existing snippets.