Fix tag requirement on pypi travis-ci

This should fix the deploy stage on the travis-ci builds caused by an
invalid yaml config.

Signed-off-by: Travis F. Collins <travis.collins@analog.com>

Author: tfcollins

.travis.yml

@@ -166,7 +166,6 @@ deploy:
       condition: "$TRAVIS_OS_NAME = osx"
       all_branches: true
   - provider: pypi
-    if: tag IS present
     skip_cleanup: true
     on:
       tags: true