L'Académie officially changed the rules on this a couple of months ago: https://www.france24.com/fr/20190228-academie-francaise-feminisation-langue-metier
As recently as 2014 they said the feminized forms (professeure, écrivaine, etc.) were "véritables barbarismes", but now their use "ne constitue pas une menace pour la structure de la langue"... They specify that the e at the end must never be pronounced though, so it's effectively just a spelling change.
