[perl5-dbi/dbi] f0efba: Add 5.20 to .travis.yml

[Tim Bunce]

  Branch: refs/heads/master
  Home:   https://github.com/perl5-dbi/dbi
  Commit: f0efba3aed19cfaf03c1c3c69942bb32ee5a2c08
      
https://github.com/perl5-dbi/dbi/commit/f0efba3aed19cfaf03c1c3c69942bb32ee5a2c08
  Author: Tim Bunce <tim.bu...@pobox.com>
  Date:   2014-09-21 (Sun, 21 Sep 2014)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Add 5.20 to .travis.yml