Use hopefully faster container-based builders on Travis-CI.

Author: SimonSapin

.travis.yml

@@ -1,3 +1,4 @@
+sudo: false
 language: rust
 
 script:
@@ -9,8 +10,8 @@ after_success: |
   [ $TRAVIS_BRANCH = master ] &&
   [ $TRAVIS_PULL_REQUEST = false ] &&
   echo '<meta http-equiv=refresh content=0;url=cssparser/index.html>' > target/doc/index.html &&
-  sudo pip install ghp-import &&
-  ghp-import -n target/doc &&
+  pip install --user ghp-import &&
+  ~/.local/bin/ghp-import -n target/doc &&
   git push -qf https://${TOKEN}@github.com/${TRAVIS_REPO_SLUG}.git gh-pages
 
 env: