travis: work around timeouts during upload
travis: work around timeouts during upload

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

fathomstudio/killbill-bluepay-plugin,killbill/killbill-hello-world-java-plugin,fathomstudio/killbill-bluepay-plugin,trifonnt/killbill-java-plugin-two-servlets