chore(package): update eslint to version 3.15.0
chore(package): update eslint to version 3.15.0

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