Changes

Changes from Mercurial (hg https://foss.heptapod.net/isa-afp/afp-devel/ default)

Changeset 13057:56381425e759 by fabian huch _huch@in.tum.de_: adjust Stalnaker_Logic to changes in Epistemic_Logic;
The file was modified	`thys/Stalnaker_Logic/Stalnaker_Logic.thy`