Support deleting contacts

Fixes #16
3 jobs for 16-delete-contact in 1 minute and 58 seconds (queued for 1 minute and 53 seconds)
Status Job ID Name Coverage
  Test
passed #5798
pycodestyle

00:00:36

passed #5799
pylint

00:00:43

passed #5800
pytest

00:00:38

93.0%