Change indent for package.json from 2 to 4 spaces
Change indent for package.json from 2 to 4 spaces

Minor style issue more than anything.

If using `php artisan preset` it will use PHP's `JSON_PRETTY_PRINT` to rewrite the file (https://github.com/laravel/framework/blob/master/src/Illuminate/Foundation/Console/Presets/Preset.php#L44). `JSON_PRETTY_PRINT` uses four spaces for indentation, causing the entire file contents to be altered upon a diff.

Rather than adding logic to change the indentation after executing `json_encode()` in `Illuminate\Foundation\Console\Presets\Preset`, it seems easier to just fix the default indentation in `package.json`. NPM doesn't seem to change the spacing at all, so this seems like a happy medium.
zeropingheroes/lanyard,tinywitch/laravel,cbnuke/FilesCollection,slimkit/thinksns-plus,hackel/laravel,zhiyicx/thinksns-plus,zeropingheroes/lanyard,cbnuke/FilesCollection,zhiyicx/thinksns-plus,slimkit/thinksns-plus,hackel/laravel,hackel/laravel,zeropingheroes/lanyard