Remove :extra_note hook from _bye
Remove :extra_note hook from _bye

Fixes #8

According to the 1.1.0 release notes, hook is deprecated. Since
I'm not aware of how to replicate the functionality with Deface,
I'm suggesting removing the feature so the extension works
without throwing an error, at least until someone can replicate
the functionality.

madetech/spree_print_invoice,MercaFly/spree_print_invoice,nebulab/spree_print_invoice,fajrif/spree_print_invoice,sunny2601/spree_print_invoice,heritageid/invoice,simo163/solidus_print_invoice,sunny2601/spree_print_invoice,tgfi/spree_print_invoice,MercaFly/spree_print_invoice,simo163/solidus_print_invoice,firmanm/spree_print_invoice,maximedelpit/spree_print_invoice,FadliKun/spree_print_invoice,spree-contrib/spree_print_invoice,madetech/spree_print_invoice,spree-contrib/spree_print_invoice,spree-contrib/spree_print_invoice,FadliKun/spree_print_invoice,nebulab/spree_print_invoice,firmanm/spree_print_invoice,simo163/solidus_print_invoice,tgfi/spree_print_invoice,madetech/spree_print_invoice,sunny2601/spree_print_invoice,heritageid/invoice,adaddeo/spree_print_invoice,MercaFly/spree_print_invoice,FadliKun/spree_print_invoice,fajrif/spree_print_invoice,fajrif/spree_print_invoice,adaddeo/spree_print_invoice,nebulab/spree_print_invoice,heritageid/invoice,firmanm/spree_print_invoice,tgfi/spree_print_invoice,maximedelpit/spree_print_invoice,maximedelpit/spree_print_invoice