Update for travis-docker's change

See https://github.com/moul/travis-docker/pull/13

diff --git a/.travis.yml b/.travis.yml
index 89981bb53892b7549dec0cd0169b1ef858f98eeb..a3297007a6b7ef3264f7dde471d602f4b8d63bf3 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,5 @@
+sudo: true
+
 install:
   - curl -sLo - https://github.com/moul/travis-docker/raw/master/install.sh | sh -xe