title: Kivy TextInput how to change hint_text font size
body: <p>Is there a way to change a TextInput hint_text font size in Kivy? I could not find any documentation on using something as <code>hint_text_size</code>.</p>
  <pre><code>TextInput:
      id: text_input_unique
      hint_text: 'example: Stand25'
      hint_text_size: 16
      multiline: False
      size_hint_y: None
      height: 50
      font_size: 32
      halign: 'center'
      cursor_color: (0,0,0,1)
  </code></pre>