TravisCI: duckpan DDG fails with old version of autodie.

utf8::all bails out when autodie is < 2.11. Adding cpanm autodie will pull in the latest version and duckpan DDG should work for Perls 5.1 and 5.16 then.
Merge pull request #587 from duckduckgo/jag/autodie

TravisCI: duckpan DDG fails with old version of autodie.