Added class validation for the enum

ref #6

src/models/actions/CreatePermission.ts

@@ -1,4 +1,5 @@
 import {
+    IsEnum,
     IsInt,
     IsNotEmpty
 } from "class-validator";
@@ -25,12 +26,14 @@ export class CreatePermission {
      * The permissions's target.
      */
     @IsNotEmpty()
+    @IsEnum(PermissionTarget)
     target: PermissionTarget;
 
     /**
      * The permissions's action.
      */
     @IsNotEmpty()
+    @IsEnum(PermissionAction)
     action: PermissionAction;
 
     /**