[mousetrap] travis-ci: add sudo: required

[Heidi Ellis <heidiellis src gnome org>]

commit f848df306ed776e971f17326f0fe32bd844a7669
Author: Stoney Jackson <dr stoney gmail com>
Date:   Wed Apr 15 12:51:13 2015 -0400

    travis-ci: add sudo: required
    
    Travis-CI no longer supports sudo by default. The fix is to add `sudo: required`
    in .travis.yml. However, this is a short-term fix, and will not work for any
    new activations. In their announcement, they suggest looking into their APT
    addon.

 .travis.yml |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/.travis.yml b/.travis.yml
index 4a0c357..d8ae55c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,7 @@
 language: python
 
+sudo: required
+
 python:
   - 2.7
   - 3.2