update README: add syncPermissions(), clear trailing whitespacing

README.md

@@ -13,7 +13,7 @@ Powerful package for handling roles and permissions in Laravel 5 (5.1 and also 5
     - [Checking For Roles](#checking-for-roles)
     - [Levels](#levels)
     - [Creating Permissions](#creating-permissions)
-    - [Attaching And Detaching Permissions](#attaching-and-detaching-permissions)
+    - [Attaching, Detaching and Syncing Permissions](#attaching-detaching-and-syncing-permissions)
     - [Checking For Permissions](#checking-for-permissions)
     - [Permissions Inheriting](#permissions-inheriting)
     - [Entity Check](#entity-check)
@@ -53,14 +53,14 @@ Add the package to your application service providers in `config/app.php` file.
 
 ```php
 'providers' => [
-    
+
     /*
      * Laravel Framework Service Providers...
      */
     Illuminate\Foundation\Providers\ArtisanServiceProvider::class,
     Illuminate\Auth\AuthServiceProvider::class,
     ...
-    
+
     /**
      * Third Party Service Providers...
      */
@@ -155,7 +155,7 @@ if ($user->isAdmin()) {
 And of course, there is a way to check for multiple roles:
 
 ```php
-if ($user->is('admin|moderator')) { 
+if ($user->is('admin|moderator')) {
     /*
     | Or alternatively:
     | $user->is('admin, moderator'), $user->is(['admin', 'moderator']),
@@ -179,7 +179,7 @@ if ($user->is('admin|moderator', true)) {
 ### Levels
 
 When you are creating roles, there is optional parameter `level`. It is set to `1` by default, but you can overwrite it and then you can do something like this:
- 
+
 ```php
 if ($user->level() > 4) {
     //
@@ -209,7 +209,7 @@ $deleteUsersPermission = Permission::create([
 ]);
 ```
 
-### Attaching And Detaching Permissions
+### Attaching, Detaching and Syncing Permissions
 
 You can attach permissions to a role or directly to a specific user (and of course detach them as well).
 
@@ -227,9 +227,11 @@ $user->attachPermission($deleteUsersPermission); // permission attached to a use
 ```php
 $role->detachPermission($createUsersPermission); // in case you want to detach permission
 $role->detachAllPermissions(); // in case you want to detach all permissions
+$role->syncPermissions($permissions); // you can pass Eloquent collection, or just an array of ids
 
 $user->detachPermission($deleteUsersPermission);
 $user->detachAllPermissions();
+$user->syncPermissions($permissions); // you can pass Eloquent collection, or just an array of ids
 ```
 
 ### Checking For Permissions