travis: update to latest build configuration
travis: update to latest build configuration

Signed-off-by: Pierre-Alexandre Meyer <ff019a5748a52b5641624af88a54a2f0e46a9fb5@mouraf.org>

kisdead/killbill-analytics-plugin,daliwei/killbill-analytics-plugin,daliwei/killbill-analytics-plugin,kisdead/killbill-analytics-plugin,killbill/killbill-analytics-plugin,kevinpostlewaite/killbill-analytics-plugin,kevinpostlewaite/killbill-analytics-plugin,daliwei/killbill-analytics-plugin,kisdead/killbill-analytics-plugin,kevinpostlewaite/killbill-analytics-plugin,killbill/killbill-analytics-plugin,daliwei/killbill-analytics-plugin,kevinpostlewaite/killbill-analytics-plugin,kisdead/killbill-analytics-plugin