Update CHANGELOG with UI section
Update CHANGELOG with UI section

vivekjuneja/marathon,timcharper/marathon,Kosta-Github/marathon,yp-engineering/marathon,vivekjuneja/marathon,meln1k/marathon,meln1k/marathon,timcharper/marathon,titosand/marathon,vivekjuneja/marathon,meln1k/marathon,janisz/marathon,Caerostris/marathon,natemurthy/marathon,meln1k/marathon,guenter/marathon,guenter/marathon,guenter/marathon,Caerostris/marathon,guenter/marathon,Kosta-Github/marathon,gsantovena/marathon,ss75710541/marathon,Caerostris/marathon,timcharper/marathon,janisz/marathon,guenter/marathon,ss75710541/marathon,janisz/marathon,pgkelley4/marathon,ss75710541/marathon,mesosphere/marathon,pgkelley4/marathon,gsantovena/marathon,Caerostris/marathon,mesosphere/marathon,gsantovena/marathon,janisz/marathon,Caerostris/marathon,mesosphere/marathon,gsantovena/marathon,meln1k/marathon,gsantovena/marathon,mesosphere/marathon,janisz/marathon,mesosphere/marathon,natemurthy/marathon,titosand/marathon,yp-engineering/marathon,natemurthy/marathon