Unpin 'tornado' dep pulled in by flower (#10993)
Unpin 'tornado' dep pulled in by flower (#10993)

'tornado' version was pinned in https://github.com/apache/airflow/pull/4815

The underlying issue is fixed for Py 3.5.2 so that is not a problem. Also since Airflow Master is already Py 3.6+ this does not apply to us.
apache/airflow,apache/incubator-airflow,nathanielvarona/airflow,mistercrunch/airflow,mrkm4ntr/incubator-airflow,sekikn/incubator-airflow,mrkm4ntr/incubator-airflow,nathanielvarona/airflow,lyft/incubator-airflow,dhuang/incubator-airflow,bolkedebruin/airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,apache/airflow,sekikn/incubator-airflow,apache/incubator-airflow,mistercrunch/airflow,lyft/incubator-airflow,DinoCow/airflow,airbnb/airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,airbnb/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,apache/incubator-airflow,mistercrunch/airflow,airbnb/airflow,airbnb/airflow,lyft/incubator-airflow,apache/airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,apache/airflow,mistercrunch/airflow,danielvdende/incubator-airflow,bolkedebruin/airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,DinoCow/airflow,DinoCow/airflow,apache/airflow,dhuang/incubator-airflow,bolkedebruin/airflow,cfei18/incubator-airflow,lyft/incubator-airflow,danielvdende/incubator-airflow,mrkm4ntr/incubator-airflow,apache/incubator-airflow,Acehaidrey/incubator-airflow,sekikn/incubator-airflow,bolkedebruin/airflow,apache/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,DinoCow/airflow,sekikn/incubator-airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,dhuang/incubator-airflow,mrkm4ntr/incubator-airflow,Acehaidrey/incubator-airflow,dhuang/incubator-airflow