Merge branch 'passoft_py3_bugs' into 'master'

Fix "error writing fixed header" bug

See merge request !9
4 jobs for master in 43 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Test
passed linting #2677
passoft

00:00:36

passed python3.6 #2678
passoft

00:00:35

passed python3.7 #2679
passoft

00:00:38

passed python3.8 #2680
passoft

00:00:42