Update CHANGELOG.md for v2.3.0 release [skip ci]
Update CHANGELOG.md for v2.3.0 release [skip ci]

Nubisproject/nubis-dpaste,tinnightcap/nubis-dpaste,tinnightcap/nubis-dpaste,Nubisproject/nubis-dpaste,limed/nubis-dpaste,limed/nubis-dpaste