update badges

Author: rsokl

README.md

@@ -3,7 +3,7 @@
 [![Build Status](https://travis-ci.com/rsokl/custom_inherit.svg?branch=master)](https://travis-ci.com/rsokl/custom_inherit#)
 [![PyPi version](https://img.shields.io/pypi/v/custom_inherit.svg)](https://pypi.python.org/pypi/custom_inherit)
  [![Conda Version](https://img.shields.io/conda/vn/conda-forge/custom-inherit.svg)](https://anaconda.org/conda-forge/custom-inherit)
-[![Python version support](https://img.shields.io/badge/python-2.7%20%20%203.4%20%203.5%20%203.6%20%203.7%203.8-blue.svg)](https://img.shields.io/pypi/v/custom_inherit.svg)
+[![Python version support](https://img.shields.io/badge/python-2.7,%20%20%203.4%20%20%20--%203.9-blue.svg)](https://img.shields.io/pypi/v/custom_inherit.svg)
 ## Contents
  - [Overview](#overview)
  - [Basic Usage](#basic-usage)