Change copyright owner to "Urbit"
Change copyright owner to "Urbit"

The copyright notice mentioned the Free Software Foundation, while the
LICENSE.txt file mentions simply "Urbit". It makes sense to change it to
the latter.

Also added myself to contributors.
dcow/urbit,8l/urbit,daveloyall/urbit,dphiffer/urbit,chc4/urbit,chc4/urbit,urbit/archaeology-factor,daveloyall/urbit,bvschwartz/urbit,Gunga/urbit,dcow/urbit,bollu/urbit,galenwp/urbit,philippeback/urbit,urbit/archaeology-factor,bvschwartz/urbit,rsaarelm/urbit,Gunga/urbit,bollu/urbit,dphiffer/urbit,philippeback/urbit,yebyen/urbit,burtonsamograd/urbit,daveloyall/urbit,daveloyall/urbit,bvschwartz/urbit,bvschwartz/urbit,jpt4/urbit,burtonsamograd/urbit,bollu/urbit,yebyen/urbit,dphiffer/urbit,urbit/archaeology-factor,urbit/archaeology-factor,galenwp/urbit,yebyen/urbit,8l/urbit,bvschwartz/urbit,8l/urbit,philipcmonk/urbit,dphiffer/urbit,bollu/urbit,galenwp/urbit,jpt4/urbit,Gunga/urbit,philipcmonk/urbit,philippeback/urbit,urbit/archaeology-factor,dcow/urbit,burtonsamograd/urbit,dcow/urbit,chc4/urbit,rsaarelm/urbit,philippeback/urbit,bollu/urbit,Gunga/urbit,yebyen/urbit,rsaarelm/urbit,jpt4/urbit,dphiffer/urbit,yebyen/urbit,galenwp/urbit,burtonsamograd/urbit,daveloyall/urbit,daveloyall/urbit,urbit/archaeology-factor,urbit/archaeology-factor,rsaarelm/urbit,dphiffer/urbit,bvschwartz/urbit,8l/urbit,bollu/urbit,galenwp/urbit,dphiffer/urbit,yebyen/urbit,chc4/urbit,galenwp/urbit,galenwp/urbit,rsaarelm/urbit,jpt4/urbit,urbit/archaeology-factor,rsaarelm/urbit,dphiffer/urbit,yebyen/urbit,8l/urbit,chc4/urbit,bvschwartz/urbit,Gunga/urbit,yebyen/urbit,chc4/urbit,Gunga/urbit,jpt4/urbit,bollu/urbit,8l/urbit,jpt4/urbit,chc4/urbit,philippeback/urbit,daveloyall/urbit,burtonsamograd/urbit,burtonsamograd/urbit,philipcmonk/urbit,yebyen/urbit,burtonsamograd/urbit,bvschwartz/urbit,bollu/urbit,dphiffer/urbit,8l/urbit,chc4/urbit,galenwp/urbit,rsaarelm/urbit,dcow/urbit,galenwp/urbit,8l/urbit,philipcmonk/urbit,bollu/urbit,yebyen/urbit,daveloyall/urbit,philippeback/urbit,dcow/urbit,daveloyall/urbit,dphiffer/urbit,philippeback/urbit,Gunga/urbit,rsaarelm/urbit,philipcmonk/urbit,daveloyall/urbit,urbit/archaeology-factor,burtonsamograd/urbit,jpt4/urbit,philipcmonk/urbit,Gunga/urbit,burtonsamograd/urbit,philippeback/urbit,Gunga/urbit,bvschwartz/urbit,jpt4/urbit,galenwp/urbit,burtonsamograd/urbit,philipcmonk/urbit,jpt4/urbit,8l/urbit,Gunga/urbit,dcow/urbit,jpt4/urbit,rsaarelm/urbit,chc4/urbit,urbit/archaeology-factor,philipcmonk/urbit,rsaarelm/urbit,8l/urbit,philipcmonk/urbit,philippeback/urbit,philippeback/urbit,bvschwartz/urbit,bollu/urbit,philipcmonk/urbit,dcow/urbit,dcow/urbit,chc4/urbit