setup.py: fixed license mismatch

fixes #22
11 jobs for license-mismatch in 4 minutes and 24 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #432695
build:debian:jessie

00:03:27

passed #432696
build:debian:stretch

00:01:27

passed #432694
build:el7

00:01:03

passed #432693
build:tarball

00:00:32

 
  Test
passed #432702
docs

00:00:55

passed #432703
syntax

00:00:44

passed #432697
test:python2.7

00:00:42

passed #432698
test:python3.4

00:00:46

passed #432699
test:python3.5

00:00:44

passed #432700
test:python3.6

00:00:43

passed #432701
test:python3.7

00:00:43