feat: fix README badges (#2)

diff --git a/README.md b/README.md
index e7bc576..e387431 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 [![Version](https://img.shields.io/pypi/v/sqlobject_adapter.svg)](https://pypi.org/project/sqlobject_adapter/)

 [![PyPI - Wheel](https://img.shields.io/pypi/wheel/sqlobject_adapter.svg)](https://pypi.org/project/sqlobject_adapter/)

 [![Pyversions](https://img.shields.io/pypi/pyversions/sqlobject_adapter.svg)](https://pypi.org/project/sqlobject_adapter/)

-[![Download](https://img.shields.io/pypi/dm/sqlobject_adapter.svg)](https://pypi.org/project/sqlobject_adapter/)

+[![Download](https://static.pepy.tech/badge/sqlobject_adapter)](https://pypi.org/project/sqlobject_adapter/)

 [![License](https://img.shields.io/pypi/l/sqlobject_adapter.svg)](https://pypi.org/project/sqlobject_adapter/)

 

 SQLObject Adapter is the [SQLObject](http://www.sqlobject.org/index.html) adapter for [PyCasbin](https://github.com/casbin/pycasbin). With this library, Casbin can load policy from SQLObject supported database or save policy to it.