travis: Move os declarations earlier

.travis.yml

@@ -20,6 +20,10 @@ branches:
   only:
     - master
 
+os:
+  - linux
+  - osx
+
 osx_image: xcode8.3
 
 env:
@@ -50,9 +54,6 @@ script:
   - export COVERALLS_SERVICE_NAME=travis-ci
   - export COVERALLS_REPO_TOKEN=abc12345
   - . ./.travis.sh
-os:
-  - linux
-  - osx
  
 after_success:
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then cd ${TRAVIS_BUILD_DIR} && lcov --directory . --capture --output-file coverage.info && lcov --remove coverage.info '/usr/*' 'contrib/*' 'test/*' --output-file coverage.info && lcov --list coverage.info && coveralls-lcov --source-encoding=ISO-8859-1 --repo-token=${COVERALLS_TOKEN} coverage.info ; fi