Update CHANGES for 0.3.
Update CHANGES for 0.3.

sudomesh/babeld,jech/babeld,Drooids/babeld,Gwendocg/babeldToS,woniullb/babeld,Gwendocg/babeldToS,wlanslovenija/babeld,boutier/babeld,dtaht/babeld-shortrtt-metrics,jech/babeld,tcatm/babeld,wlanslovenija/babeld