update changelog for npm@2.8.1
update changelog for npm@2.8.1

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