Test using the latest Perl on Travis

Created by: muffato

Use case

Perl 5.14 not being available on Travis @ xenial, Ensembl as a whole is considering a bump of the minimal version (@s-mm brought this up to the ops meeting). All the teams have to start testing on the latest Perl, which is 5.30

Description

Just bumped the version in .travis.yml

Possible Drawbacks

None

Testing

Have you added/modified unit tests to test the changes?

N/A

Have you run the entire test suite and no regression was detected?

Yes