simplify variants/combintation explanation doc, use bash-style substitution for envlist (although it conflicts with the general {} subsitution which should maybe become ${...}. IOW, re-use more of bash syntax.
simplify variants/combintation explanation doc,
use bash-style substitution for envlist (although it conflicts
with the general {} subsitution which should maybe become ${...}.
IOW, re-use more of bash syntax.

jcb91/tox