#10004: in Q encoded word ignore '=xx' when xx is not valid hex.

Bug report and fix by Thomas Guettler.
diff --git a/Misc/NEWS b/Misc/NEWS
index 8e99376..3aa6a6d 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -79,6 +79,9 @@
 Library
 -------
 
+- Issue #10004: quoprimime no longer generates a traceback when confronted
+  with invalid characters after '=' in a Q-encoded word.
+
 - Issue #1491: BaseHTTPServer nows send a 100 Continue response before sending
   a 200 OK for the Expect: 100-continue request header.