travis: Update tested node versions
travis: Update tested node versions

Credit: da39a3ee5e6b4b0d3255bfef95601890afd80709@iarna
Reviewed-By: da39a3ee5e6b4b0d3255bfef95601890afd80709@othiym23
PR-URL: https://github.com/npm/npm/pull/10233

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