added announcement to readme (#5282)
added announcement to readme (#5282)


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