Fix TRAVIS environment variable

Author: phatblat

.travis.yml

@@ -1,13 +1,15 @@
 osx_image: xcode7.3
 language: objective-c
-env:
-  - TRAVIS=true
 matrix:
   include:
     - osx_image: xcode7.3
-      env: SCHEME="ObjectiveGit Mac"
+      env:
+        - TRAVIS=true
+        - SCHEME="ObjectiveGit Mac"
     - osx_image: xcode7.3
-      env: SCHEME="ObjectiveGit iOS"
+      env:
+        - TRAVIS=true
+        - SCHEME="ObjectiveGit iOS"
 before_install:
   - gem install xcpretty
   - gem install xcpretty-travis-formatter