Switch back to PHP 5.4 class name resolution.

Author: eseyden

src/Config/config.php

@@ -26,7 +26,7 @@
     |
     */
 
-    'connection' => Adldap\Connections\Ldap::class,
+    'connection' => 'Adldap\Connections\Ldap',
 
     /*
     |--------------------------------------------------------------------------
@@ -157,4 +157,4 @@
 
     ],
 
-];
+];