Add ndbm move. (#299)


diff --git a/documentation/index.rst b/documentation/index.rst
index 6753617..3b1c244 100644
--- a/documentation/index.rst
+++ b/documentation/index.rst
@@ -586,6 +586,8 @@
 +------------------------------+-------------------------------------+---------------------------------------+
 | ``dbm_gnu``                  | :func:`py2:gdbm`                    | :class:`py3:dbm.gnu`                  |
 +------------------------------+-------------------------------------+---------------------------------------+
+| ``dbm_ndbm``                 | :func:`py2:dbm`                     | :func:`py3:dbm.ndbm`                  |
++------------------------------+-------------------------------------+---------------------------------------+
 | ``_dummy_thread``            | :mod:`py2:dummy_thread`             | :mod:`py3:_dummy_thread`              |
 +------------------------------+-------------------------------------+---------------------------------------+
 | ``email_mime_base``          | :mod:`py2:email.MIMEBase`           | :mod:`py3:email.mime.base`            |
diff --git a/six.py b/six.py
index c09609b..49a54ea 100644
--- a/six.py
+++ b/six.py
@@ -257,6 +257,7 @@
     MovedModule("configparser", "ConfigParser"),
     MovedModule("copyreg", "copy_reg"),
     MovedModule("dbm_gnu", "gdbm", "dbm.gnu"),
+    MovedModule("dbm_ndbm", "dbm", "dbm.ndbm"),
     MovedModule("_dummy_thread", "dummy_thread", "_dummy_thread"),
     MovedModule("http_cookiejar", "cookielib", "http.cookiejar"),
     MovedModule("http_cookies", "Cookie", "http.cookies"),