Bump to 2.3.1 to pick up the missing file.
diff --git a/Lib/email/__init__.py b/Lib/email/__init__.py
index 93a156b..e18b568 100644
--- a/Lib/email/__init__.py
+++ b/Lib/email/__init__.py
@@ -4,7 +4,7 @@
 """A package for parsing, handling, and generating email messages.
 """
 
-__version__ = '2.3'
+__version__ = '2.3.1'
 
 __all__ = ['Charset',
            'Encoders',