Added class validation for the enum

ref #6

src/models/responses/ResponsePermission.ts

@@ -1,4 +1,5 @@
 import {
+    IsEnum,
     IsInt,
     IsNotEmpty,
     IsObject
@@ -29,12 +30,14 @@ export class ResponsePermission {
      * The permissions's target.
      */
     @IsNotEmpty()
+    @IsEnum(PermissionTarget)
     target: PermissionTarget;
 
     /**
      * The permissions's action.
      */
     @IsNotEmpty()
+    @IsEnum(PermissionAction)
     action: PermissionAction;
 
     public constructor(permission: Permission) {