Fix Impression Events - Variation lookup by id and Experiment id#350

Merged

The-inside-man merged 2 commits intomasterfrom

jbrown/fix-impression-events

Jul 15, 2021

Commits on Jul 15, 2021

Fix in user_event_factory to use experiment_id to lookup variation for impression events.
The-inside-man
committed
Update License Header to 2021.
The-inside-man
committed