The upgrade notes only describe necessary changes that you might need to make to your setup in order to use a new role release. Refer to the epoptes__ref_changelog for more details about what has changed.
All inventory variables have been renamed so you might need to update your inventory. This script can come in handy to update a subset of variable names:
scripts/upgrade-from-v0.1.X-to-v0.2.X
The script is bundled with this role under ./docs/scripts/upgrade-from-v0.1.X-to-v0.2.X and can be invoked from there.
Note that you will need to update your inventory manually according to the documentation. The epoptes__rooms variable has been changed from a list to a dictionary which you might need to update manually in your inventory.