Update LICENSE
Update LICENSE

Updated copyright year.

It says the copyright owner is Boxbilling, Inc. Is this still an existing entity and is it correct?
boxbilling/boxbilling,boxbilling/boxbilling,boxbilling/boxbilling,gOOvER/boxbilling,boxbilling/boxbilling,gOOvER/boxbilling,gOOvER/boxbilling,gOOvER/boxbilling