Document the license change.

ChangeLog

@@ -1,5 +1,6 @@
 2005-12-01  Paul Eggert  <[email protected]>
 
+	* NEWS: Document the following change.
 	* data/yacc.c: Say "parser skeleton" rather than "file", since
 	it's no longer just a file.
 	* data/glr.c: Grant a special exception for C GLR parsers, that

NEWS

@@ -3,6 +3,12 @@ Bison News
 
 Changes in version 2.1a:
 
+* GLR, C++ LALR(1) parsers.
+  These parser skeletons are now distributed with the same special
+  license exception that the C LALR(1) parser skeleton has had since
+  Bison 1.24.  Hence the FSF imposes no copyright restriction on the
+  output of Bison when it is generating such parsers.
+
 * %expect, %expect-rr
   Incorrect numbers of expected conflicts are now actual errors,
   instead of warnings.