add flushMacros method

Author: Awilum

src/Macroable.php

@@ -65,6 +65,16 @@ public static function hasMacro(string $name): bool
         return isset(static::$macros[$name]);
     }
 
+    /**
+     * Flush the existing macros.
+     *
+     * @return void
+     */
+    public static function flushMacros()
+    {
+        static::$macros = [];
+    }
+
     /**
      * Dynamically handle calls to the class.
      *