correction

.travis.yml

@@ -3,7 +3,8 @@ language: bash
 before_script:
     - curl -L "https://shunit2.googlecode.com/files/shunit2-2.1.6.tgz" | tar zx
 
-    - sudo apt-get install tmux mailutils postfix lib32gcc1 libstdc++6 libstdc++6:i386 
+    - sudo apt-get update -qq
+    - sudo apt-get install -y tmux mailutils postfix lib32gcc1 libstdc++6 libstdc++6:i386 
 
     - mkdir /home/travis/build/dgibbs64/linuxgsm/7DaysToDie/serverfiles
     - touch /home/travis/build/dgibbs64/linuxgsm/7DaysToDie/serverfiles/serverconfig.xml