chore(package): update async to version 2.2.0
chore(package): update async to version 2.2.0

https://greenkeeper.io/
Jenselme/ngeo,Jenselme/ngeo,camptocamp/ngeo,Jenselme/ngeo,camptocamp/ngeo,camptocamp/ngeo,adube/ngeo,adube/ngeo,camptocamp/ngeo,adube/ngeo,adube/ngeo,camptocamp/ngeo,Jenselme/ngeo