fix(travis): actually it should already work this way

travis-cargo knows travis, and does the right thing.
We only want to be sure to run on one platform only.

.travis.yml

@@ -15,13 +15,12 @@ matrix:
 before_script:
   - pip install 'travis-cargo<0.2' --user  && export PATH=$HOME/Library/Python/2.7/bin:$HOME/.local/bin:$PATH
 script:
-  - export
   - travis-cargo build -- --features $FEATURE --no-default-features
   - travis-cargo test -- --features $FEATURE --no-default-features
   - travis-cargo doc -- --features $FEATURE --no-default-features
 after_success:
-  - travis-cargo --only stable doc-upload
-  - travis-cargo --only stable coveralls
+  - "[[ $TRAVIS_OS_NAME = linux ]] && travis-cargo --only stable doc-upload"
+  - "[[ $TRAVIS_OS_NAME = linux ]] && travis-cargo --only stable coveralls"
 env:
   global:
     - TRAVIS_CARGO_NIGHTLY_FEATURE=""