changes: provisional 1.1.0rc1 header

docs/changes.rst

@@ -131,6 +131,9 @@ The best check that everything is ok is to run a dry-run extraction::
 Changelog
 =========
 
+Version 1.1.0rc1 (unreleased)
+-----------------------------
+
 Version 1.1.0b6 (2017-06-18)
 ----------------------------