Use FieldsPreparer instead of Preparer in Manifesto example
Use FieldsPreparer instead of Preparer in Manifesto example

Signed-off-by: Balthazar Rouberol <a9d237650e4d4cb3de4969f778ca372566bedbf9@mapado.com>

jangeador/restless,toastdriven/restless,tonybajan/restless,CraveFood/restkiss,pobear/restless,viniciuscainelli/restless