Do not clean changes before deploying pre-releases

Signed-off-by: Ivan Kanakarakis <ivan.kanak@gmail.com>

Author: c00kiemon5ter

.travis.yml

@@ -64,6 +64,7 @@ jobs:
       script:
         - read -r CURRENT_VERSION <VERSION
         - printf -- '%s-%s\n' "${CURRENT_VERSION}" "${TRAVIS_BUILD_NUMBER}" >VERSION
+      skip_cleanup: true
       deploy:
         - provider: pypi
           distributions: sdist bdist_wheel