#17431: Fix missing import of BytesFeedParser in email.parser.

Initial patch contributed by Edmond Burnett.
diff --git a/Lib/email/parser.py b/Lib/email/parser.py
index 1c931ea..4e96732 100644
--- a/Lib/email/parser.py
+++ b/Lib/email/parser.py
@@ -9,7 +9,7 @@
 import warnings
 from io import StringIO, TextIOWrapper
 
-from email.feedparser import FeedParser
+from email.feedparser import FeedParser, BytesFeedParser
 from email.message import Message