Update the amount of days in the create-list tutorial (#831)

create-list.md

@@ -3,7 +3,7 @@
 - Read the [awesome manifesto](https://github.com/sindresorhus/awesome/blob/master/awesome.md) and ensure your list complies.
 - Search this list before making a new one, as yours may be a duplicate. If it is, try and contribute to the best one instead of making your own.
 - Your awesome list should be named `awesome-list-name` and have the [awesome badge](https://github.com/sindresorhus/awesome/blob/master/awesome.md#awesome-badge), a [license](https://github.com/sindresorhus/awesome/blob/master/awesome.md#choose-an-appropriate-license), and [contribution guidelines](https://github.com/sindresorhus/awesome/blob/master/awesome.md#include-contribution-guidelines). Adding a [code of conduct](http://contributor-covenant.org/) is also strongly recommended.
-- **Wait at least 20 days after creating a list before submitting it, to give it a chance to mature.**
+- **Wait at least 30 days after creating a list before submitting it, to give it a chance to mature.**
 - Make sure you read the [contribution guidelines](https://github.com/sindresorhus/awesome/blob/master/contributing.md) before submitting a request for your list to be added here.
 
 Thanks for being awesome!