add alipay, An Unofficial Alipay API for Python

Author: lxneng

README.md

@@ -469,6 +469,7 @@ A curated list of awesome Python frameworks, libraries and software. Inspired by
 * [merchant](https://github.com/agiliq/merchant) - A Django app to accept payments from various payment processors.
 * [money](https://github.com/carlospalol/money) - Money class with optional CLDR-backed locale-aware formatting and an extensible currency exchange solution.
 * [python-currencies](https://github.com/Alir3z4/python-currencies) - Display money format and its filthy currencies.
+* [alipay](https://github.com/lxneng/alipay) - Unofficial Alipay API for Python.
 
 ## RESTful API