Add Full 9.0.1 changelog

CHANGELOG.md

@@ -6,8 +6,11 @@ omnibus-gitlab repository.
 9.0.1
 - Allow configuration of prepared statement caching in Rails 169891c2
-- Default redis promethues exporter to off if redis is not managed locally
-- Default postgres promethues exporter to off if postgres is not managed locally
+- Default redis promethues exporter to off if redis is not managed locally 63056441
+- Default postgres promethues exporter to off if postgres is not managed locally 63056441
+- Default pages http to https redirect to off 1ece2480
+- Make HSTS easier to configure, and the docs on it accurate 4ba90ff8
+- Move the automatic PG Upgrade to happen after migrations have run 8cf38d43
 9.0