Enable Docker-based builds.
diff --git a/.travis.yml b/.travis.yml
index cf4f8ca..bdcd986 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,3 +12,4 @@
   - go get github.com/mattn/goveralls
   - export PATH=$PATH:$HOME/gopath/bin/
   - goveralls 2k7PTU3xa474Hymwgdj6XjqenNfGTNkO8
+sudo: false