Update README.md

Author: esron

README.md

@@ -40,7 +40,8 @@ class User extends Authenticatable
 :---------|:---------------------------|:----------
  5.5.x    | 4.0.x, 5.0.x, 6.0.x, 7.0.x | 1.1.x
  5.6.x    | 4.0.x, 5.0.x, 6.0.x, 7.0.x | 1.1.x
-
+ 6.x      | 4.0.x, 5.0.x, 6.0.x, 7.x   | 1.2.x
+  
 And add the service provider in `config/app.php`:
 
 ```php