Revert "Travis: temporary debugging of HTTPS issue"
Revert "Travis: temporary debugging of HTTPS issue"

The issue was with Maven Central certificate

This reverts commit f6d7ff8db2edc361d7edec379e0ac78897c4c3d0.

InfoSec812/vertx-sql-common,InfoSec812/vertx-sql-common,InfoSec812/vertx-sql-common