add event hook info to CHANGELOG
add event hook info to CHANGELOG

pingjiang/ractive,ractivejs/ractive,aliprogrammer69/ractive,heavyk/ractive,cgvarela/ractive,p0lax/ractive,ISNIT0/ractive,magicdawn/ractive,Rich-Harris/ractive,aliprogrammer69/ractive,ndimas/ractive,cgvarela/ractive,cgvarela/ractive,Rich-Harris/ractive,squaredup/ractive,pingjiang/ractive,ndimas/ractive,Rich-Harris/ractive,ndimas/ractive,marcalexiei/ractive,ISNIT0/ractive,marcalexiei/ractive,thomsbg/ractive,thomsbg/ractive,ractivejs/ractive,squaredup/ractive,heavyk/ractive,JonDum/ractive,heavyk/ractive,ISNIT0/ractive,dyx/ractive,JonDum/ractive,ractivejs/ractive,pingjiang/ractive,squaredup/ractive,dyx/ractive,magicdawn/ractive,aliprogrammer69/ractive,dyx/ractive,p0lax/ractive,JonDum/ractive,marcalexiei/ractive,magicdawn/ractive,thomsbg/ractive