Update the version list.

Author: Julian

README.md

@@ -52,10 +52,15 @@ they should be valid or invalid.
 Coverage
 --------
 
-Drafts 03, 04, 06, and 07 should have full coverage, with drafts 06 and 07
-being considered current and actively supported.  Bug fixes will be made as
-needed for draft-04 as it is still the most widely used, while draft-03
-is long since deprecated.
+Drafts 07, 06, 04 and 03 should have full coverage, with drafts 06 and
+07 being considered current and actively supported.
+
+Draft 2019-09 support is under development. Contributions are very
+welcome, especially from implementers as they add support to their own
+implementations.
+
+Bug fixes will be made as needed for draft-04 as it is still the most
+widely used, while draft-03 is long since deprecated.
 
 If you see anything missing from the current supported drafts, or incorrect
 on any draft still accepting bug fixes, please file an issue or submit a PR.