added: laravel 5.7 support

Author: exodusanto

composer.json

@@ -19,7 +19,7 @@
 	},
 	"require": {
 		"php": ">=7.1.3",
-		"laravel/framework": "5.6.*",
+		"laravel/framework": "5.7.*",
 		"ckeditor/ckeditor": "4.*"
 	},
 	"require-dev": {

readme.md

@@ -18,28 +18,16 @@ New Version
 
 ## Composer
 
-To install Administrator as a Composer package to be used with Laravel 5.6, simply run:
+To install Administrator as a Composer package to be used with Laravel 5.7, simply run:
 
 ```sh
-composer require "exodusanto/administrator: 5.6.*"
+composer require "exodusanto/administrator: 5.7.*"
 ```
 
-To install Administrator as a Composer package to be used with Laravel 5.5, simply run:
-
-```sh
-composer require "exodusanto/administrator: 5.5.*"
-```
-
-To install Administrator as a Composer package to be used with Laravel 5.4, simply run:
-
-```sh
-composer require "exodusanto/administrator: 5.4.*"
-```
-
-To install Administrator as a Composer package to be used with Laravel 5, simply run:
+To install Administrator as a Composer package to be used with Laravel 5.6, simply run:
 
 ```sh
-composer require "exodusanto/administrator: 5.*"
+composer require "exodusanto/administrator: 5.6.*"
 ```
 
 Once it's installed, you can register the service provider in `config/app.php` in the `providers` array:
@@ -87,6 +75,9 @@ Administrator is released under the MIT License. See the LICENSE file for detail
 
 ## Recent Changelog
 
+### 5.7.0
+- Support: Laravel 5.7
+
 ### 5.6.5
 - Added: Allow custom routes name (#23)