Update README with feature flag
Update README with feature flag

malloryerik/chestnut,neverfox/chestnut,Jobava/chestnut,Jobava/chestnut,neverfox/chestnut,jacqt/chestnut,Jobava/chestnut,plexus/chestnut,jacqt/chestnut,Nek/chestnut,plexus/chestnut,neverfox/chestnut,Nek/chestnut,Nek/chestnut,malloryerik/chestnut,malloryerik/chestnut