Added multi-role framework support to the CHANGELOG.
Added multi-role framework support to the CHANGELOG.

Review: https://reviews.apache.org/r/57707

gsantovena/mesos,kaysoky/mesos,neilconway/mesos,reneploetz/mesos,jpeach/mesos,Gilbert88/mesos,andschwa/mesos,kaysoky/mesos,jpeach/mesos,craimbert/mesos,dforsyth/mesos,neilconway/mesos,chhsia0/mesos,craimbert/mesos,reneploetz/mesos,neilconway/mesos,dforsyth/mesos,chhsia0/mesos,chhsia0/mesos,andschwa/mesos,dforsyth/mesos,abudnik/mesos,abudnik/mesos,Gilbert88/mesos,dforsyth/mesos,zmalik/mesos,jpeach/mesos,zmalik/mesos,abudnik/mesos,gsantovena/mesos,dforsyth/mesos,kaysoky/mesos,andschwa/mesos,jpeach/mesos,verizonlabs/mesos,Gilbert88/mesos,gsantovena/mesos,reneploetz/mesos,Gilbert88/mesos,andschwa/mesos,chhsia0/mesos,kaysoky/mesos,verizonlabs/mesos,zmalik/mesos,craimbert/mesos,abudnik/mesos,gsantovena/mesos,asamerh4/mesos,abudnik/mesos,asamerh4/mesos,neilconway/mesos,verizonlabs/mesos,gsantovena/mesos,abudnik/mesos,zmalik/mesos,neilconway/mesos,gsantovena/mesos,asamerh4/mesos,verizonlabs/mesos,chhsia0/mesos,neilconway/mesos,verizonlabs/mesos,kaysoky/mesos,reneploetz/mesos,Gilbert88/mesos,jpeach/mesos,neilconway/mesos,asamerh4/mesos,jpeach/mesos,verizonlabs/mesos,Gilbert88/mesos,andschwa/mesos,verizonlabs/mesos,zmalik/mesos,reneploetz/mesos,Gilbert88/mesos,jpeach/mesos,abudnik/mesos,reneploetz/mesos,craimbert/mesos,craimbert/mesos,asamerh4/mesos,reneploetz/mesos,kaysoky/mesos,zmalik/mesos,asamerh4/mesos,dforsyth/mesos,kaysoky/mesos,craimbert/mesos,andschwa/mesos,andschwa/mesos,chhsia0/mesos,craimbert/mesos,zmalik/mesos,dforsyth/mesos,gsantovena/mesos,asamerh4/mesos,chhsia0/mesos