:construction_worker: Switch Travis to Bionic
:construction_worker: Switch Travis to Bionic

Ubuntu 14.04 is a bit old, now.

chaosdorf/mete,YtvwlD/mete,YtvwlD/mete,YtvwlD/mete,chaosdorf/mete,chaosdorf/mete,chaosdorf/mete,YtvwlD/mete