`/shutdown` command is handled whatever the method.
`/shutdown` command is handled whatever the method.

Closes Issue #119.
51ttw/ghostdriver,51ttw/ghostdriver,jesg/ghostdriver,stevenliuit/ghostdriver,yuanzhen/ghostdriver,asolntsev/ghostdriver,Vitallium/ghostdriver,treejames/ghostdriver,Vitallium/ghostdriver,stevenliuit/ghostdriver,jesg/ghostdriver,HelioGuilherme66/ghostdriver,jesg/ghostdriver,acarpe/ghostdriver,amikey/ghostdriver,jesg/ghostdriver,xsyntrex/ghostdriver,xsyntrex/ghostdriver,yuanzhen/ghostdriver,HelioGuilherme66/ghostdriver,antoinereyt/ghostdriver,detro/ghostdriver,kuahyeow/ghostdriver,acarpe/ghostdriver,kuahyeow/ghostdriver,detro/ghostdriver,asolntsev/ghostdriver,Lochlan/ghostdriver,amikey/ghostdriver,detro/ghostdriver,Lochlan/ghostdriver,antoinereyt/ghostdriver,treejames/ghostdriver,HelioGuilherme66/ghostdriver