This is the command I used to encrypt the databaseUrl:
testTravis (master) $ travis encrypt --com databaseUrl="moobz"
Please add the following to your .travis.yml file:
secure: "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"
Pro Tip: You can add it automatically by running with --add.
testTravis (master) $ see this for the travis output: https://travis-ci.com/bj97301/testTravis/jobs/156522714