refactor(travis): Add sudo to apt installs

Author: ehdsouza

.travis.yml

@@ -1,5 +1,5 @@
 language: python
-sudo: false
+sudo: required
 python:
 - '2.7'
 - '3.4'
@@ -21,7 +21,7 @@ before_deploy:
 - pip install -r requirements.txt
 - pip install -r requirements-dev.txt
 - pip install pypandoc
-- apt-get install pandoc
+- sudo apt-get install pandoc
 - pip install --editable .
 deploy:
   - provider: script