The stock modules on Travis seem to be broken, so try building with latest.

The error message was:

[MetaYAML] Invalid META structure. Errors found:
[MetaYAML] Expected a list structure (license) [Validation: 2]
[MetaYAML] Invalid META structure. Errors found:
[MetaYAML] Expected a list structure (license) [Validation: 2] at /home/travis/perl5/perlbrew/perls/5.16/lib/site_perl/5.16.3/x86_64-linux/Moose/Meta/Method/Delegation.pm line 110.