🎉 Aravis 0.8.5 stable release

Hi,

I have released Aravis 0.8.5, which fix the build for macOS.

The macOS build is now back under Travis continuous integration, and hopefully it will not break again.

The release tarball is available at the usual place: https://ftp.gnome.org/pub/gnome/sources/aravis/0.8/

Have fun using Aravis.

Cheers,

Emmanuel.