change: update header in changelog to v4
change: update header in changelog to v4

PhinCo/sequelize,mikeringrose/sequelize,konnecteam/sequelize,Alexsey/sequelize,overlookmotel/sequelize,Verdier/sequelize,grimurd/sequelize,jayprakash1/sequelize,konnecteam/sequelize,pola88/sequelize,Americas/sequelize,yjwong/sequelize,inDream/sequelize,nemisj/sequelize,majorleaguesoccer/sequelize,yonjah/sequelize,PsiXdev/sequelize,jayprakash1/sequelize,overlookmotel/sequelize,sequelize/sequelize,inDream/sequelize,Americas/sequelize,Wsiegenthaler/sequelize,sequelize/sequelize,gorangajic/sequelize,sequelize/sequelize,p0vidl0/sequelize,cbauerme/sequelize