only build on osx

.travis.yml

@@ -1,8 +1,8 @@
-sudo: false
+language: objective-c
 
-os:
-  - linux
-  - osx
+osx_image: beta-xcode6.2
+
+sudo: false
 
 git:
   depth: 10
@@ -70,11 +70,3 @@ before_install:
   # Elm
   - curl -L -o /tmp/elm-format.tgz https://github.com/avh4/elm-format/releases/download/0.1-alpha2/elm-format-0.1-alpha2-mac-x64.tgz
   - tar xvzf /tmp/elm-format.tgz -C /usr/local/bin
-
-addons:
-  apt:
-    packages:
-    - build-essential
-    - git
-    - libgnome-keyring-dev
-    - fakeroot