Remove DictMixin which is superceded by collections.MutableMapping
diff --git a/Lib/bsddb/dbshelve.py b/Lib/bsddb/dbshelve.py
index 942ee17..3727270 100644
--- a/Lib/bsddb/dbshelve.py
+++ b/Lib/bsddb/dbshelve.py
@@ -32,8 +32,7 @@
 import pickle
 import sys
 
-#At version 2.3 cPickle switched to using protocol instead of bin and
-#DictMixin was added
+#At version 2.3 cPickle switched to using protocol instead of bin
 if sys.version_info[:3] >= (2, 3, 0):
     HIGHEST_PROTOCOL = pickle.HIGHEST_PROTOCOL
     def _dumps(object, protocol):