chore(package): update eslint to version 3.12.1
chore(package): update eslint to version 3.12.1

https://greenkeeper.io/
matthewstyers/keystone,ONode/keystone,vokal/keystone,vokal/keystone,trentmillar/keystone,andrewlinfoot/keystone,trentmillar/keystone,ratecity/keystone,trentmillar/keystone,rafmsou/keystone,Pop-Code/keystone,danielmahon/keystone,danielmahon/keystone,andrewlinfoot/keystone,rafmsou/keystone,matthewstyers/keystone,vokal/keystone,naustudio/keystone,andrewlinfoot/keystone,benkroeger/keystone,benkroeger/keystone,danielmahon/keystone,Pop-Code/keystone,matthewstyers/keystone,naustudio/keystone,concoursbyappointment/keystoneRedux,frontyard/keystone,dryna/keystone-twoje-urodziny,dryna/keystone-twoje-urodziny,frontyard/keystone,linhanyang/keystone,concoursbyappointment/keystoneRedux,frontyard/keystone,ratecity/keystone,benkroeger/keystone,brianjd/keystone,brianjd/keystone,naustudio/keystone,ONode/keystone