Laravel 5.6 updates

Travis config update

Removed HHVM script as Laravel no longer support HHVM after releasing 5.3

vendor/laravel/framework/src/Illuminate/Auth/SessionGuard.php

@@ -4,6 +4,7 @@ namespace Illuminate\Auth;
 
 use RuntimeException;
 use Illuminate\Support\Str;
+use Illuminate\Support\Facades\Hash;
 use Illuminate\Support\Traits\Macroable;
 use Illuminate\Contracts\Session\Session;
 use Illuminate\Contracts\Auth\UserProvider;
@@ -90,7 +91,7 @@ class SessionGuard implements StatefulGuard, SupportsBasicAuth
      * @param  string  $name
      * @param  \Illuminate\Contracts\Auth\UserProvider  $provider
      * @param  \Illuminate\Contracts\Session\Session  $session
-     * @param  \Symfony\Component\HttpFoundation\Request  $request
+     * @param  \Symfony\Component\HttpFoundation\Request|null  $request
      * @return void
      */
     public function __construct($name,
@@ -533,6 +534,26 @@ class SessionGuard implements StatefulGuard, SupportsBasicAuth
         $this->provider->updateRememberToken($user, $token);
     }
 
+    /**
+     * Invalidate other sessions for the current user.
+     *
+     * The application must be using the AuthenticateSession middleware.
+     *
+     * @param  string  $password
+     * @param  string  $attribute
+     * @return null|bool
+     */
+    public function logoutOtherDevices($password, $attribute = 'password')
+    {
+        if (! $this->user()) {
+            return;
+        }
+
+        return tap($this->user()->forceFill([
+            $attribute => Hash::make($password),
+        ]))->save();
+    }
+
     /**
      * Register an authentication attempt event listener.
      *