tox: allow apps that support color to use it.
tox: allow apps that support color to use it.


lukecwik/incubator-beam,apache/beam,chamikaramj/beam,apache/beam,robertwb/incubator-beam,lukecwik/incubator-beam,chamikaramj/beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam,chamikaramj/beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam,lukecwik/incubator-beam,apache/beam,apache/beam,chamikaramj/beam,chamikaramj/beam,apache/beam,apache/beam,robertwb/incubator-beam,apache/beam,robertwb/incubator-beam,chamikaramj/beam,robertwb/incubator-beam,apache/beam,robertwb/incubator-beam,robertwb/incubator-beam,robertwb/incubator-beam,robertwb/incubator-beam,chamikaramj/beam,chamikaramj/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,apache/beam,lukecwik/incubator-beam,robertwb/incubator-beam,lukecwik/incubator-beam,lukecwik/incubator-beam,robertwb/incubator-beam