Travis: list the installed packages the current test is ran with
Travis: list the installed packages the current test is ran with

Signed-off-by: Giel van Schijndel <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@mortis.eu>

tiagocoutinho/pint,tiagocoutinho/pint,dmwelch/pint