Update .travis.yml

Co-authored-by: Simeon Simeonoff <[email protected]>

Author: zdrawku

.travis.yml

@@ -8,7 +8,7 @@ before_install:
 - export DISPLAY=:99.0
 - sh -e /etc/init.d/xvfb start
 - sudo apt-get -qq update
-- sudo apt-get install -y libappindicator1 fonts-liberation
+- sudo apt-get install -y libappindicator1 fonts-liberation dpkg
 - sudo apt-get install -y dpkg  # to upgrade to dpkg >= 1.17.5ubuntu5.8
 - wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
 - sudo dpkg -i google-chrome*.deb