Add $roles to composite pattern (kamranahmedse#86)

composite pattern: added protected variable $roles in two classes implementing the class Employee

Author: appseng

README.md

@@ -792,7 +792,8 @@ class Developer implements Employee
 {
  protected $salary;
  protected $name;
-
+ protected $roles;
+ 
  public function __construct(string $name, float $salary)
  {
  $this->name = $name;
@@ -824,6 +825,7 @@ class Designer implements Employee
 {
  protected $salary;
  protected $name;
+ protected $roles;
 
  public function __construct(string $name, float $salary)
  {