#11686: add missing entries to email __all__ lists.

Original patch by Steffen Daode Nurpmeso
diff --git a/Lib/email/parser.py b/Lib/email/parser.py
index 6caaff5..1c931ea 100644
--- a/Lib/email/parser.py
+++ b/Lib/email/parser.py
@@ -4,7 +4,7 @@
 
 """A parser of RFC 2822 and MIME email messages."""
 
-__all__ = ['Parser', 'HeaderParser']
+__all__ = ['Parser', 'HeaderParser', 'BytesParser']
 
 import warnings
 from io import StringIO, TextIOWrapper