Update .travis.yml

.travis.yml

@@ -11,9 +11,6 @@ before_install:
   - sudo apt-get -qq update
   - sudo apt-get install -y libpulse-dev
   - sudo apt-get install -y libxrandr-dev
-  - sudo apt-get install -y libgtk-3-dev
-  - sudo apt-get install -y valac
-  - sudo apt-get install -y libgee-0.8-dev
 
 script:
   - make engine-linux-debug64 && ./build/engine/linux64/bin/crown-debug-64 --run-unit-tests