0.2.* => 1.0.0

from upsert-foreign! [conn [id-ks id] parent-ks parent-id child-ks to-be-saved] to
upsert-foreign! [conn parent-ks parent-id child-ks to-be-saved]
- id-ks and id where redundant with parent-ks and parent-id,
  so they were unified

1.* => 2.0.0

upsert-foreign! [conn parent-ks parent-id child-ks to-be-saved] to
upsert-foreign! [conn foreign-ks foreign-id ref-ks main-ks main-id]
- upsert foreign was not working at all, now it is inserting or updating foreign refs with :db/add

dcontext as first argument arities was removed from all functions, due to confusion adding new features. Simply remove the first argument if you are using it
to mock database functions instead of using dcontext use with-derefs