Merge pull request humiaozuzu#161 from muhammadh-s/patch-1

added a framework in development category

README.md

@@ -156,6 +156,7 @@
 - [pytest-flask](https://github.com/pytest-dev/pytest-flask) - A set of pytest fixtures to test Flask applications
 - [Flask-MonitoringDashboard](https://github.com/flask-dashboard/Flask-MonitoringDashboard) - Automatically monitor the evolving performance of Flask/Python web services.
 - [nplusone](https://github.com/jmcarp/nplusone#flask-sqlalchemy) - Auto-detect n+1 queries with Flask and SQLAlchemy
+- [connexion](https://github.com/zalando/connexion) - Swagger/OpenAPI First framework for Python on top of Flask with automatic endpoint validation & OAuth2 support.
 
 ## Utils