Fix README for Duplicate implicit target name: "storyboard"

While releasing new version in pypi, it perform the
validation on the package and give error if there is any
formatting issue.

warning: check: Duplicate implicit target name: "storyboard".
error: Please correct your package.

- http://logs.openstack.org/68/645868/1/check/openstack-tox-validate/9d9219e/job-output.txt.gz#_2019-03-22_20_15_40_332673

This commit fixes the format error to release the patrole.

Change-Id: Ie840743b61bab5c833f554bb40b6a162e790a29f
1 file changed