Removed trait PowerJoins set up

Author: luisdalmolin

README.md

@@ -35,17 +35,6 @@ composer require kirschbaum-development/eloquent-power-joins:2.*
 
 ## Usage
 
-On any model you want to be able to use the methods described below, you should use the following trait:
-
-```php
-use Kirschbaum\PowerJoins\PowerJoins;
-
-class User extends Model
-{
-    use PowerJoins;
-}
-```
-
 This package provides a few features.
 
 ### 1 - Join Relationship