update link to project BRUG and Ruby Burgers
update link to project BRUG and Ruby Burgers

Due to rebranding of the meetup BRUG, and closing of the
meetup ruby burgers.

otagi/rubybelgium,brug-be/rubybelgium,brug-be/rubybelgium,otagi/rubybelgium,brug-be/rubybelgium,otagi/rubybelgium