setup.cfg: removed dependency statement on m2crypto

this repo has no imports/usage of that module
5 jobs for no-m2crypto in 4 minutes and 13 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
passed #327006
build:debian:jessie

00:03:45

passed #327007
build:debian:stretch

00:01:17

passed #327005
build:el7

00:00:48

passed #327004
build:tarball

00:00:21

 
  Test
passed #327008
doc

00:00:27