Keep calm and check the deadline now!
Due to the UK leaving the EU, there is now a transition period until the 31st of December 2020 while the new regulations and agreements are been negotiated. The current european binding rules remain valid (i.e. migration, residency, employment, free trade and competition, driving, etc).
New rules for living, working, travelling and doing business are to be observed from the 1st of January 2021 onwards between the UK and the EU.