add gopkg plugin (#1725)
add gopkg plugin (#1725)


devangels/caddy,cez81/caddy,captncraig/caddy,devangels/caddy,devangels/caddy,cez81/caddy,tobya/caddy,yukimochi/caddy,captncraig/caddy,cez81/caddy,tobya/caddy,tobya/caddy,tobya/caddy,joshix/caddy,joshix/caddy,joshix/caddy,yukimochi/caddy,yukimochi/caddy,dusty/caddy,dusty/caddy,dusty/caddy,captncraig/caddy,dusty/caddy