Update LICENSE and CONTRIBUTORS to mention Cloudflare as a copyright holder.

CONTRIBUTORS

@@ -2,7 +2,7 @@ The following people have made large code contributions to this repository.
 Those contributions are copyright the respective authors and licensed by them
 under the same MIT license terms as the rest of the library.
 
-Kenton Varda <kenton@sandstorm.io>: Primary Author
+Kenton Varda <kenton@sandstorm.io> <kenton@cloudflare.com>: Primary Author
 Jason Choy <jjwchoy@gmail.com>: kj/threadlocal.h and other iOS tweaks, `name` annotation in C++ code generator
 Remy Blank <rblank@google.com> (contributions copyright Google Inc.): KJ Timers
 Joshua Warner <joshuawarner32@gmail.com>: cmake build, AnyStruct/AnyList, other stuff

LICENSE

-Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
+Copyright (c) 2013-2017 Sandstorm Development Group, Inc.; Cloudflare, Inc.;
+and other contributors. Each commit is copyright by its respective author or
+author's employer.
+
 Licensed under the MIT License:
 
 Permission is hereby granted, free of charge, to any person obtaining a copy