TODO before merging:

• Check with demo that everything works as expected (add console.logs everywhere) !

Then, before next release:

• Add recomputeSnapshot method on EventStore class.
• Add reducer hash in EventStore props and store it in snapshots + validate on read that it is still up-to-date (otherwise, recompute snapshot)
• Create recomputeSnapshots method on EventStore class that iterates on aggregateIds and snapshots, and recompute them if reducer hash is not up-to-date