Remove sudo requirement

.travis.yml

@@ -1,9 +1,14 @@
-sudo: required
 language: python
 
 python:
   - "2.7"
 
+addons:
+  apt:
+    packages:
+      - expect-dev  # provides unbuffer utility
+      - python-lxml  # because pip installation is slow
+
 env:
   - VERSION="7.0" ODOO_REPO="odoo/odoo"
   - VERSION="7.0" ODOO_REPO="OCA/OCB"
@@ -15,7 +20,7 @@ install:
   - git clone https://github.com/OCA/maintainer-quality-tools.git ${HOME}/maintainer-quality-tools
   - export PATH=${HOME}/maintainer-quality-tools/travis:${PATH}
   - travis_install_nightly
-  - sudo pip install unidecode BeautifulSoup
+  - pip install unidecode BeautifulSoup
 
 script:
   - travis_run_tests