Update README.md for 7.20.0 (#6772)
Update README.md for 7.20.0 (#6772)

* Update README.md

* Fix spelling

* Fix note
DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core