Fix #189 - preload_metadata option on s3boto3 (#190)
Fix #189 - preload_metadata option on s3boto3 (#190)

Looks like boto3 changed some keyword arguments and this prefix forgot to be captalised

Signed-off-by: Leon Smith <53a0acfad59379b3e050338bf9f23cfc172ee787@leonmarksmith.com>
ZuluPro/django-storages,faxioman/django-storages,chenjyw/django-storages,juiceinc/django-storages,mroth23/django-storages,chenjyw/django-storages,syapse/django-storages,mbarrien/django-storages,hobarrera/django-storages,jschneier/django-storages