Added changelog for 0.17.0
Changes
=======
+0.17.0 (2020-06-16)
+-------------------
+- Proper support for Python 3.8. Now correctly handles
+ `CancelledError` exceptions that previously sent a lot of
+ unwanted output on service shutdown or restart.
+
+- Updated dependencies across the board, utilizing
+ package versions that supports Python 3.8.
+
+- Dropped support for Python 3.5.
+
+- Now gracefully handles shutdown for HTTP based services,
+ by awaiting active requests and giving them time to finish.
+ By default the ongoing HTTP requests will have 30 seconds to
+ complete their work, which can also be configured via
+ ``options.http.termination_grace_period_seconds``.
+
+- Taking steps into making the codebase following more modern
+ patterns. Additional updates to be followed in a later release.
+
+
0.16.6 (2020-02-25)
-------------------
- Removes the dependency on ``ujson``.
