Fixed docstring typo in ResponseLater
Fixed docstring typo in ResponseLater

doown => down
wengole/channels,andrewgodwin/django-channels,andrewgodwin/channels,Krukov/channels,Krukov/channels,Coread/channels,Coread/channels,octaflop/channels,raiderrobert/channels,django/channels,linuxlewis/channels,raphael-boucher/channels