Fix Image.download for wikis that do not return a full url. Fix by Hannes Holm Ovrén.
Fix Image.download for wikis that do not return a full url. Fix by Hannes Holm Ovrén.

Jobava/mirror-mwclient,mwclient/mwclient,AdamWill/mwclient,PierreSelim/mwclient,JeroenDeDauw/mwclient,ubibene/mwclient,danmichaelo/mwclient