update version number and indicate as under-development
update version number and indicate as under-development

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