Update CHANGELOG for 0.15 releases
Update CHANGELOG for 0.15 releases

r7kamura/thor,flyinbutrs/thor,fhernandez173/thor,segiddins/thor,erikhuda/thor,sideci-sample/sideci-sample-thor,groovenauts/thor,b-dean/thor,segiddins/thor,groovenauts/thor,r7kamura/thor,sideci-sample/sideci-sample-thor,flyinbutrs/thor,fhernandez173/thor,linkodehub/thor,fancyremarker/thor,fancyremarker/thor,linkodehub/thor,doudou/thor,b-dean/thor