UPDATING.md for changes included in 2.1.1 (#16615)
UPDATING.md for changes included in 2.1.1 (#16615)


Acehaidrey/incubator-airflow,bolkedebruin/airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,apache/incubator-airflow,lyft/incubator-airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,apache/incubator-airflow,danielvdende/incubator-airflow,bolkedebruin/airflow,apache/airflow,danielvdende/incubator-airflow,bolkedebruin/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,apache/airflow,mistercrunch/airflow,dhuang/incubator-airflow,nathanielvarona/airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,mistercrunch/airflow,bolkedebruin/airflow,cfei18/incubator-airflow,mistercrunch/airflow,danielvdende/incubator-airflow,lyft/incubator-airflow,lyft/incubator-airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,mistercrunch/airflow,dhuang/incubator-airflow,bolkedebruin/airflow,apache/airflow,lyft/incubator-airflow,dhuang/incubator-airflow,danielvdende/incubator-airflow,apache/incubator-airflow,apache/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,apache/airflow,dhuang/incubator-airflow,apache/airflow,apache/airflow,nathanielvarona/airflow,nathanielvarona/airflow