Merge branch 'issues/9' into 'master'

Add integration tests for db2json and json2db

Closes #9

See merge request !5
3 jobs for master in 5 minutes and 50 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Test
passed coverage #17943

00:00:26

passed integration #17944

00:05:49

passed linter #17942

00:00:52