Fix typo in changelog

Author: defuz

CHANGES

@@ -32,7 +32,7 @@ Version 1.0
   different design and also replaces ``Flask-Script``.
 - Error handlers that match specific classes are now checked first,
   thereby allowing catching exceptions that are subclasses of HTTP
-  exceptions (in ``werkzeug.execptions``).  This makes it possible
+  exceptions (in ``werkzeug.exceptions``).  This makes it possible
   for an extension author to create exceptions that will by default
   result in the HTTP error of their choosing, but may be caught with
   a custom error handler if desired.