Add a CHANGES entry for the unrecognised record type change

Reviewed-by: NTim Hudson <tjh@openssl.org>

CHANGES

@@ -4,7 +4,11 @@
 
  Changes between 1.1.0a and 1.1.1 [xx XXX xxxx]
 
-  *)
+  *) OpenSSL now fails if it receives an unrecognised record type in TLS1.0
+     or TLS1.1. Previously this only happened in SSLv3 and TLS1.2. This is to
+     prevent issues where no progress is being made and the peer continually
+     sends unrecognised record types, using up resources processing them.
+     [Matt Caswell]
 
   *) 'openssl passwd' can now produce SHA256 and SHA512 based output,
      using the algorithm defined in