update README: 'brain-py' to 'brainpy' (#174)

update README: 'brain-py' to 'brainpy'

Author: chaoming0625

README.md

@@ -5,10 +5,10 @@
 
 
 <p align="center">
-	<a href="https://pypi.org/project/brain-py/"><img alt="Supported Python Version" src="https://img.shields.io/pypi/pyversions/brain-py"></a>
+	<a href="https://pypi.org/project/brainpy/"><img alt="Supported Python Version" src="https://img.shields.io/pypi/pyversions/brainpy"></a>
 	<a href="https://github.com/PKU-NIP-Lab/BrainPy"><img alt="LICENSE" src="https://anaconda.org/brainpy/brainpy/badges/license.svg"></a>
   	<a href="https://brainpy.readthedocs.io/en/latest/?badge=latest"><img alt="Documentation" src="https://readthedocs.org/projects/brainpy/badge/?version=latest"></a>
-  	<a href="https://badge.fury.io/py/brain-py"><img alt="PyPI version" src="https://badge.fury.io/py/brain-py.svg"></a>
+  	<a href="https://badge.fury.io/py/brainpy"><img alt="PyPI version" src="https://badge.fury.io/py/brainpy.svg"></a>
     <a href="https://github.com/PKU-NIP-Lab/BrainPy"><img alt="Linux CI" src="https://github.com/PKU-NIP-Lab/BrainPy/actions/workflows/Linux_CI.yml/badge.svg"></a>
     <a href="https://github.com/PKU-NIP-Lab/BrainPy"><img alt="Linux CI" src="https://github.com/PKU-NIP-Lab/BrainPy/actions/workflows/Windows_CI.yml/badge.svg"></a>
     <a href="https://github.com/PKU-NIP-Lab/BrainPy"><img alt="Linux CI" src="https://github.com/PKU-NIP-Lab/BrainPy/actions/workflows/MacOS_CI.yml/badge.svg"></a>