Update README.md

Author: huyiwen

README.md

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 # ml_scheduler
 
-[![PyPI version](https://badge.fury.io/py/ml_scheduler.svg)](http://badge.fury.io/py/ml_scheduler)
+[![PyPI version](https://badge.fury.io/py/ml-scheduler.svg)](http://badge.fury.io/py/ml-scheduler)
 [![License](https://img.shields.io/github/license/mashape/apistatus.svg)](https://pypi.python.org/pypi/ml_scheduler/)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![Imports: isort](https://img.shields.io/badge/%20imports-isort-%231674b1?style=flat&labelColor=ef8336)](https://timothycrosley.github.io/isort/)