update changelog for npm@2.1.7
update changelog for npm@2.1.7

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