Remove shared yml commands

Author: charleskawczynski

.travis.yml

@@ -26,9 +26,12 @@ env:
     - PYTHON=conda
 
 before_install:
- - julia -e 'using Pkg; Pkg.add("Conda")'
- - julia -e 'using Conda; Conda.add("scikit-learn")'
- - julia -e 'using Pkg; Pkg.build("PyCall"); Pkg.update()'
+  - |
+    if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+      julia -e 'using Pkg; Pkg.add("Conda")'
+      julia -e 'using Conda; Conda.add("scikit-learn")'
+      julia -e 'using Pkg; Pkg.build("PyCall"); Pkg.update()'
+    fi
 
 before_script:
   - |