remove stray import of anydbm (#646)

diff --git a/dill/_objects.py b/dill/_objects.py
index 87143a7..7723c13 100644
--- a/dill/_objects.py
+++ b/dill/_objects.py
@@ -16,7 +16,7 @@
 import warnings; warnings.filterwarnings("ignore", category=DeprecationWarning)
 import sys
 import queue as Queue
-import dbm as anydbm
+#import dbm as anydbm #XXX: delete foo
 from io import BytesIO as StringIO
 import re
 import array