Add support for windows and macos on linux travis ci job (#716)

Signed-off-by: flacatus <flacatus@redhat.com>

.travis.yml

@@ -30,7 +30,7 @@ before_deploy:
     sed -i sed "s#version\":\ \"\(.*\)\",#version\":\ \"$CHECTL_VERSION\",#g" package.json
     git tag $TRAVIS_TAG
     npx oclif-dev pack
-    npx oclif-dev pack --targets=linux-s390x
+    npx oclif-dev pack --targets=linux-s390x,darwin-x64,win32-x64,win32-x86
     git clone https://github.com/che-incubator/chectl -b gh-pages --single-branch gh-pages
     rm -rf gh-pages/.git
     echo $(date +%s) > gh-pages/update