clarify that config.extra can be any object
clarify that config.extra can be any object

crossbario/autobahn-python,bencharb/AutobahnPython,jvdm/AutobahnPython,dash-dash/AutobahnPython,inirudebwoy/AutobahnPython,Geoion/AutobahnPython,dash-dash/AutobahnPython,meejah/AutobahnPython,hzruandd/AutobahnPython,ttimon7/AutobahnPython,iffy/AutobahnPython,Jenselme/AutobahnPython,RyanHope/AutobahnPython,oberstet/autobahn-python,schoonc/AutobahnPython,crossbario/autobahn-python,nucular/AutobahnPython,dash-dash/AutobahnPython,tavendo/AutobahnPython,oberstet/autobahn-python,iffy/AutobahnPython,markope/AutobahnPython,tomwire/AutobahnPython,iffy/AutobahnPython,oberstet/autobahn-python,iffy/AutobahnPython,crossbario/autobahn-python,dash-dash/AutobahnPython