Package only on darwin

Author: kylecarbs

.travis.yml

@@ -25,7 +25,7 @@ before_deploy:
 - git config --local user.name "$USER_NAME"
 - git config --local user.email "$USER_EMAIL"
 - git tag "$VERSION" "$TRAVIS_COMMIT"
-- yarn task package "$VERSION"
+- if [[ “$TRAVIS_OS_NAME” == “osx” ]]; then yarn task package $VERSION; fi
 deploy:
   provider: releases
   file_glob: true