title: Min value for input in Simple Form
body: <p>I want to create a simple money input with <a href="https://github.com/plataformatec/simple_form" rel="noreferrer">SimpleForm</a>.</p>
  
  <p>The money field should have a minimum value of 0, so that a user cannot enter a value less than 0.</p>
  
  <p>However I don't know how to define min value with simple form.</p>
  
  <p>I wonder if it's possible.</p>