Update .travis.yml

Author: JElchison

.travis.yml

@@ -4,11 +4,11 @@ sudo: required
 
 before_install:
   - sudo apt-get -qq update
-  - sudo apt-get install -y udftools coreutils vim-common
+  - sudo apt-get install -y udftools coreutils vim-common udisks2
   - curl https://ftp-master.debian.org/keys/archive-key-7.0.asc | sudo apt-key add -
   - echo "deb http://ftp.us.debian.org/debian unstable main contrib non-free" | sudo tee -a /etc/apt/sources.list
   - sudo apt-get -qq update
-  - sudo apt-get install shellcheck -y
+  - sudo apt-get install -y shellcheck
 
 install:
  - pip install --user bashate