Merge branch 'add/lint' into 'master'

add linting

See merge request !6
3 jobs for master in 3 minutes and 14 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #662
test_7.0

00:03:14

passed #663
test_7.1

00:02:31

passed #664
test_7.2

00:02:31