Fix all copyright dates.
Fix all copyright dates.

dropwizard/metrics,wickedshimmy/metrics-scala,cirrus-dev/metrics,slovdahl/metrics,ChetnaChaudhari/metrics,tempredirect/metrics,Banno/metrics,dropwizard/metrics,ind9/metrics,mveitas/metrics,mattnelson/metrics,gorzell/metrics,bentatham/metrics,fcrepo4-archive/metrics,gorzell/metrics,AltitudeDigital/metrics,fcrepo4-archive/metrics,randomstatistic/metrics,wfxiang08/metrics,dropwizard/metrics,rexren/metrics,mt0803/metrics,jasw/metrics,unitsofmeasurement/metrics,slachiewicz/metrics,timezra/metrics,mveitas/metrics,signalfx/metrics,egymgmbh/metrics,mnuessler/metrics,kevintvh/metrics,mspiegel/metrics,maciej/metrics-scala,erikvanoosten/metrics-scala,jplock/metrics,infusionsoft/yammer-metrics,chenxianghua2014/metrics,scullxbones/metrics-scala,gorzell/metrics,gburton1/metrics,infusionsoft/yammer-metrics,gburton1/metrics,valery1707/dropwizard-metrics,ohr/metrics,mtakaki/metrics,thelastpickle/metrics