COPR fail to build on F20

[Timotheus Pokorra]

> DEBUG util.py:378:  failure: repodata/repomd.xml from updates: [Errno 256]
> No more mirrors to try.
> DEBUG util.py:378:
> http://infrastructure.fedoraproject.org/pub/fedora/linux/updates/20/i386/repodata/repomd.xml:
> [Errno 14] HTTP Error 404 - Not Found
F20 has reached end of life:
https://fedoraproject.org/wiki/End_of_life

Please target F22 instead.

Timotheus