Add async_property (timofurrer#55)

Co-authored-by: Timo Furrer <tuxtimo@gmail.com>

README.md

@@ -121,6 +121,7 @@ Find some of those *awesome* packages here and if you are missing one we count o
 * [aioserial](https://github.com/changyuheng/aioserial) - A drop-in replacement of [pySerial](https://github.com/pyserial/pyserial).
 * [aiozipkin](https://github.com/aio-libs/aiozipkin) - Distributed tracing instrumentation for asyncio with zipkin
 * [asgiref](https://github.com/django/asgiref) - Backend utils for ASGI to WSGI integration, includes sync_to_async and async_to_sync function wrappers.
+* [async_property](https://github.com/ryananguiano/async_property) - Python decorator for async properties.
 * [ruia](https://github.com/howie6879/ruia) - An async web scraping micro-framework based on asyncio.
 * [kubernetes_asyncio](https://github.com/tomplus/kubernetes_asyncio) - Asynchronous client library for Kubernetes.
 * [aiomisc](https://github.com/aiokitchen/aiomisc) - Miscellaneous utils for `asyncio`.