Add support for 3DES CBCM mode.

CHANGES

diff --git a/CHANGES b/CHANGES
index c6b9e89..7a4d64c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5,6 +5,12 @@
 
  Changes between 0.9.1c and 0.9.2
 
+  *) Add support for Triple DES Cipher Block Chaining with Output Feedback
+     Masking (CBCM). In the absence of test vectors, the best I have been able
+     to do is check that the decrypt undoes the encrypt, so far. Send me test
+     vectors if you have them.
+     [Ben Laurie]
+
   *) Correct caclulation of key length for export ciphers (too much space was
      allocated for null ciphers). This has not been tested!
      [Ben Laurie]