update changelog for npm@2.4.0
update changelog for npm@2.4.0

misterbyrne/npm,evocateur/npm,rsp/npm,kemitchell/npm,DaveEmmerson/npm,segrey/npm,ekmartin/npm,kimshinelove/naver-npm,Volune/npm,cchamberlain/npm,thomblake/npm,rsp/npm,cchamberlain/npm,chadnickbok/npm,princeofdarkness76/npm,chadnickbok/npm,DaveEmmerson/npm,Volune/npm,evanlucas/npm,DaveEmmerson/npm,cchamberlain/npm,lxe/npm,xalopp/npm,yodeyer/npm,midniteio/npm,evocateur/npm,cchamberlain/npm-msys2,kimshinelove/naver-npm,thomblake/npm,evocateur/npm,Volune/npm,DIREKTSPEED-LTD/npm,evanlucas/npm,xalopp/npm,lxe/npm,cchamberlain/npm-msys2,haggholm/npm,yibn2008/npm,DIREKTSPEED-LTD/npm,haggholm/npm,xalopp/npm,yibn2008/npm,haggholm/npm,misterbyrne/npm,princeofdarkness76/npm,evanlucas/npm,segrey/npm,yibn2008/npm,lxe/npm,ekmartin/npm,yodeyer/npm,misterbyrne/npm,TimeToogo/npm,ekmartin/npm,thomblake/npm,midniteio/npm,DIREKTSPEED-LTD/npm,segrey/npm,kemitchell/npm,kemitchell/npm,cchamberlain/npm-msys2,TimeToogo/npm,princeofdarkness76/npm,kimshinelove/naver-npm,TimeToogo/npm,rsp/npm,yodeyer/npm,midniteio/npm,chadnickbok/npm