circleci: update to use Ubuntu 17.10
circleci: update to use Ubuntu 17.10

17.04 is EOL

Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>

libratbag/libratbag,libratbag/libratbag,whot/libratbag,whot/libratbag,libratbag/libratbag,whot/libratbag