Fixing celery link

Author: spekulatius

README.md

@@ -1114,7 +1114,7 @@ Inspired by [awesome-php](https://github.com/ziadoz/awesome-php).
 
 *Libraries for working with task queues.*
 
-* [celery](http://www.celeryproject.org/) - An asynchronous task queue/job queue based on distributed message passing.
+* [celery](https://github.com/celery/celery) - An asynchronous task queue/job queue based on distributed message passing.
 * [daramatiq](https://github.com/Bogdanp/dramatiq) - A fast and reliable background task processing library for Python 3.
 * [huey](https://github.com/coleifer/huey) - Little multi-threaded task queue.
 * [mrq](https://github.com/pricingassistant/mrq) - A distributed worker task queue in Python using Redis & gevent.