Update CHANGELOG with UnauthorizedError
Update CHANGELOG with UnauthorizedError

gchan/mechanize,flavorjones/mechanize,uksa/mechanize,sjchakrav/mechanize,uksa/mechanize,eligoenergy/mechanize,gchan/mechanize,sparklemotion/mechanize,eligoenergy/mechanize,jeremiahmarks/mechanize,pwnall/mechanize,jeremiahmarks/mechanize,pwnall/mechanize,sjchakrav/mechanize,bugmelody/mechanize,sparklemotion/mechanize,bugmelody/mechanize