oops! cherry-pick the changes to changelog from 1.2.0
oops! cherry-pick the changes to changelog from 1.2.0

Banchi0123/picojson,pfultz2/picojson,karya0/picojson,turenar/picojson,kazuho/picojson,kazuho/picojson,Banchi0123/picojson,pfultz2/picojson,turenar/picojson,karya0/picojson