Update LICENSE
Update LICENSE

Update copyright notice, see related conversation from Dropwizard repo here: dropwizard/dropwizard#938 and commit dropwizard/dropwizard@9de8186
mattnelson/metrics,jplock/metrics,ind9/metrics,AltitudeDigital/metrics,kevintvh/metrics,mt0803/metrics,ohr/metrics,rexren/metrics,timezra/metrics,tempredirect/metrics,randomstatistic/metrics,ChetnaChaudhari/metrics,cirrus-dev/metrics,mspiegel/metrics,jasw/metrics,mtakaki/metrics,signalfx/metrics,valery1707/dropwizard-metrics,chenxianghua2014/metrics,bentatham/metrics,wfxiang08/metrics