Remove pyup badge

Author: mvcisback

README.md

@@ -10,7 +10,6 @@
 
 [![Build Status](https://cloud.drone.io/api/badges/mvcisback/py-aiger/status.svg)](https://cloud.drone.io/mvcisback/py-aiger)
 [![codecov](https://codecov.io/gh/mvcisback/py-aiger/branch/master/graph/badge.svg)](https://codecov.io/gh/mvcisback/py-aiger)
-[![Updates](https://pyup.io/repos/github/mvcisback/py-aiger/shield.svg)](https://pyup.io/repos/github/mvcisback/py-aiger/)
 [![PyPI version](https://badge.fury.io/py/py-aiger.svg)](https://badge.fury.io/py/py-aiger)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.1405781.svg)](https://doi.org/10.5281/zenodo.1405781)