Bump license years for 2018

MIT-LICENSE

-Copyright (c) 2005-2017 David Heinemeier Hansson
+Copyright (c) 2005-2018 David Heinemeier Hansson
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

actioncable/MIT-LICENSE

-Copyright (c) 2015-2017 Basecamp, LLC
+Copyright (c) 2015-2018 Basecamp, LLC
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

actioncable/lib/action_cable.rb

 # frozen_string_literal: true
 
 #--
-# Copyright (c) 2015-2017 Basecamp, LLC
+# Copyright (c) 2015-2018 Basecamp, LLC
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the

actionmailer/MIT-LICENSE

-Copyright (c) 2004-2017 David Heinemeier Hansson
+Copyright (c) 2004-2018 David Heinemeier Hansson
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

actionmailer/lib/action_mailer.rb

 # frozen_string_literal: true
 
 #--
-# Copyright (c) 2004-2017 David Heinemeier Hansson
+# Copyright (c) 2004-2018 David Heinemeier Hansson
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the

actionpack/MIT-LICENSE

-Copyright (c) 2004-2017 David Heinemeier Hansson
+Copyright (c) 2004-2018 David Heinemeier Hansson
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

actionpack/lib/action_dispatch.rb

 # frozen_string_literal: true
 
 #--
-# Copyright (c) 2004-2017 David Heinemeier Hansson
+# Copyright (c) 2004-2018 David Heinemeier Hansson
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the

actionpack/lib/action_pack.rb

 # frozen_string_literal: true
 
 #--
-# Copyright (c) 2004-2017 David Heinemeier Hansson
+# Copyright (c) 2004-2018 David Heinemeier Hansson
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the

actionview/MIT-LICENSE

-Copyright (c) 2004-2017 David Heinemeier Hansson
+Copyright (c) 2004-2018 David Heinemeier Hansson
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

actionview/app/assets/javascripts/MIT-LICENSE

-Copyright (c) 2007-2017 Rails Core team
+Copyright (c) 2007-2018 Rails Core team
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

actionview/lib/action_view.rb

 # frozen_string_literal: true
 
 #--
-# Copyright (c) 2004-2017 David Heinemeier Hansson
+# Copyright (c) 2004-2018 David Heinemeier Hansson
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the

activejob/MIT-LICENSE

-Copyright (c) 2014-2017 David Heinemeier Hansson
+Copyright (c) 2014-2018 David Heinemeier Hansson
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

activejob/lib/active_job.rb

 # frozen_string_literal: true
 
 #--
-# Copyright (c) 2014-2017 David Heinemeier Hansson
+# Copyright (c) 2014-2018 David Heinemeier Hansson
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the

activemodel/MIT-LICENSE

-Copyright (c) 2004-2017 David Heinemeier Hansson
+Copyright (c) 2004-2018 David Heinemeier Hansson
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

activemodel/lib/active_model.rb

 # frozen_string_literal: true
 
 #--
-# Copyright (c) 2004-2017 David Heinemeier Hansson
+# Copyright (c) 2004-2018 David Heinemeier Hansson
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the

activerecord/MIT-LICENSE

-Copyright (c) 2004-2017 David Heinemeier Hansson
+Copyright (c) 2004-2018 David Heinemeier Hansson
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

activestorage/MIT-LICENSE

-Copyright (c) 2017 David Heinemeier Hansson, Basecamp
+Copyright (c) 2017-2018 David Heinemeier Hansson, Basecamp
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

activestorage/lib/active_storage.rb

 # frozen_string_literal: true
 
 #--
-# Copyright (c) 2017 David Heinemeier Hansson
+# Copyright (c) 2017-2018 David Heinemeier Hansson, Basecamp
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the

activesupport/MIT-LICENSE

-Copyright (c) 2005-2017 David Heinemeier Hansson
+Copyright (c) 2005-2018 David Heinemeier Hansson
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

activesupport/lib/active_support.rb

 # frozen_string_literal: true
 
 #--
-# Copyright (c) 2005-2017 David Heinemeier Hansson
+# Copyright (c) 2005-2018 David Heinemeier Hansson
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the

railties/MIT-LICENSE

-Copyright (c) 2004-2017 David Heinemeier Hansson
+Copyright (c) 2004-2018 David Heinemeier Hansson
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the