Docs: Temporarily reference gulp@next in Quick Start

Docs: Temporarily reference gulp@next in Quick Start · gulpjs/gulp@2cecf1e

Original file line number	Diff line number	Diff line change
`@@ -48,7 +48,7 @@ This will guide you through giving your project a name, version, description, et`
`48`	`48`
`49`	`49`	`### Install the gulp package in your devDependencies`
`50`	`50`	```sh
`51`		`-npm install --save-dev gulp`
	`51`	`+npm install --save-dev gulp@next`
`52`	`52`	```
`53`	`53`
`54`	`54`	`### Verify your gulp versions`