docs: add options field to @Transform

Author: lucas-gregoire

README.md

@@ -759,14 +759,15 @@ it will convert a date value in your photo object to moment date.
 The `@Transform` decorator is given more arguments to let you configure how you want the transformation to be done.
 
 ```
-@Transform((value, obj, type) => value)
+@Transform((value, obj, type, options) => value)
 ```
 
 | Argument          | Description
 |--------------------|---------------------------------------------------------------------------------|
 | `value` | The property value before the transformation.
 | `obj` | The transformation source object.
 | `type` | The transformation type.
+| `options` | The options given to the input transformation method.
 
 ## Other decorators
 | Signature          | Example                                  | Description