opening two tabs on Linux

[steveklabnik]

greenkeeperio/greenkeeper#143 is the upstream issue. It seems that on my system, a call like this:

open = require('open');
open("https://greenkeeper.io");

results in two tabs being opened: https and greenkeeper.io. The problem seems to be with the vendored xdg-open, using my system's xdg-open works just fine.