chore(package): update clean-css-cli to version 4.0.12
chore(package): update clean-css-cli to version 4.0.12

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