Remove reference to AUTHORS.txt file

dhodder · dhodder · commit c331ed044335 · 2016-01-16T15:53:16.000Z
diff --git a/COPYRIGHT b/COPYRIGHT
@@ -7,7 +7,7 @@ terms.
 Longer version:
 
 The Rust Project is copyright 2016, The Rust Project
-Developers (given in the file AUTHORS.txt).
+Developers.
 
 Licensed under the Apache License, Version 2.0
 <LICENSE-APACHE or
