mention today's LIBCURL_TIMESTAMP fix

CHANGES

@@ -21,6 +21,10 @@ Daniel (12 February 2007)
   preferable in cases where you use libcurl for proxy purposes or similar. The
   command line tool got a --raw option to disable both at once.
 
+- release tarballs made with maketgz will from now on have a LIBCURL_TIMESTAMP
+  define set to hold the exact date and time of when the tarball was built, as
+  a human readable string using the UTC time zone.
+  
 - Jeff Pohlmeyer fixed a flaw in curl_multi_add_handle() when adding a handle
   that has an easy handle present in the "closure" list pending closure.