Fix voc_match_cache member (#1765)
Fix voc_match_cache member (#1765)

Seems like a rebase/merge moved this one around. It's now moved back into
__init__
Dark5ide/mycroft-core,linuxipho/mycroft-core,forslund/mycroft-core,MycroftAI/mycroft-core,MycroftAI/mycroft-core,forslund/mycroft-core,linuxipho/mycroft-core,Dark5ide/mycroft-core