lastfm-cover: Use HTTPS rather than insecure HTTP
lastfm-cover: Use HTTPS rather than insecure HTTP

To avoid leaking (potentially uniquely identifiable) user data over
plain text, use HTTPS whenever possible.

https://bugzilla.gnome.org/show_bug.cgi?id=766789

GNOME/grilo-plugins,GNOME/grilo-plugins,jasuarez/grilo-plugins,grilofw/grilo-plugins,MikePetullo/grilo-plugins,jasuarez/grilo-plugins,MikePetullo/grilo-plugins,MikePetullo/grilo-plugins,grilofw/grilo-plugins