Examples in https://git.ligo.org/emfollow/ligo-followup-advocate do not work

The example reported in the main page refere to an event and not to supervent. It show be fixed.

ligo-followup-advocate compose \
    'A. Einstein (IAS)' 'S. Hawking (Cambridge)' \
    'I. Newton (Cambridge)' 'Data (Starfleet)' \
    'G184098'

The Python interpreter example is also broken (note that it works with super-event 'S190407w':

>>> from ligo import followup_advocate
>>> text = followup_advocate.compose('S184098a')