need help removing 'dev-r0' part from a python package

[sth.srn at gmail.com]

My package 'webpreview'[https://github.com/ludbek/webpreview] has new version '1.0.3'. I used 'sdist' to bundle it. Unfortunately it names it 'webpreview-1.0.3dev-r0.tar.gz' instead of 'webpreview-1.0.3.tar.gz' making it unsuitable to upload to pypi.

What is causing sdist to append 'dev' stuff in the package. The source can be available in the link above. Thanx for you help.