addon_before and small size

[fmatray]

Hello,
This code don't show correctly.
{% bootstrap_field field layout="inline" addon_before=somelabel size="small" %}

Inputs are corrects sur the div's class in "input-group" and not "input-group input-group-sm"

there is a mission option in renderer.py
html = '<div class="**input-group**">{before}{html}{after}</div>'.format( before=self.make_input_group_addon( self.addon_before_class, "input-group-prepend", self.addon_before ), after=self.make_input_group_addon( self.addon_after_class, "input-group-append", self.addon_after ), html=html,