Mention new HPACK exception.

Lukasa · Lukasa · commit afc62f907362 · 2014-03-02T09:33:49.000Z
diff --git a/HISTORY.rst b/HISTORY.rst
@@ -5,6 +5,8 @@ X.X.X (XXXX-XX-XX)
 ------------------
 
 - Add logic for pluggable objects to manage the flow-control window.
+- Raise new ``HPACKDecodingError`` when we're unable to validly map a
+  Huffman-encoded string.
 
 0.0.3 (2014-02-26)
 ------------------
