Updated changelog for 1.3 (#4180)
Updated changelog for 1.3 (#4180)


mesosphere/marathon,guenter/marathon,janisz/marathon,meln1k/marathon,gsantovena/marathon,Caerostris/marathon,guenter/marathon,timcharper/marathon,Caerostris/marathon,mesosphere/marathon,meln1k/marathon,janisz/marathon,meln1k/marathon,natemurthy/marathon,guenter/marathon,mesosphere/marathon,janisz/marathon,Caerostris/marathon,gsantovena/marathon,natemurthy/marathon,mesosphere/marathon,gsantovena/marathon,natemurthy/marathon,meln1k/marathon,janisz/marathon,timcharper/marathon,mesosphere/marathon,gsantovena/marathon,Caerostris/marathon,guenter/marathon,meln1k/marathon,gsantovena/marathon,Caerostris/marathon,janisz/marathon,timcharper/marathon,guenter/marathon