URL paths featuring spaces don't get correctly escaped

[peternewman]

http://raw.githubusercontent.com/OpenLightingProject/logos/master/web fitted/OLA-Logo-Fitted-48px%402x.png

I 13:04:41.031 fetching http://raw.githubusercontent.com/OpenLightingProject/logos/master/web fitted/OLA-Logo-Fitted-48px%402x.png
I 13:04:41.068 image fetch failed. http://raw.githubusercontent.com/OpenLightingProject/logos/master/web fitted/OLA-Logo-Fitted-48px%402x.png -> 404

Compared to:
13:04:40.652
fetching http://raw.githubusercontent.com/OpenLightingProject/logos/master/web%20fitted/OLA-Logo-Fitted-48px%402x.png