Update changelog with new release.

Also populated the changelog with old releases that were missing

CHANGELOG.rst

@@ -2,6 +2,39 @@
 Changelog
 =========
 
+Version 2.1.0
+-------------
+
+- Specify open dependencies
+
+Version 2.0.1
+-------------
+
+- Version 2.0.0 did not work as expected. This fixes the problem with 2.0.0
+
+Version 2.0.0
+-------------
+
+- Make the pika dependency optional
+
+Version 1.2.0
+-------------
+
+- Update event schemas
+- Add badge to eiffel-pythonlib
+
+Version 1.1.1
+-------------
+
+- Add wildcard support to nackable subscriptions
+
+Version 1.1.0
+-------------
+
+- If Context is None, call a subscriber with None on Context.
+- We should use the python standard library's logging module to log messages, not print or traceback.print_exc()
+- Reconnect the connection thread if broker shuts down
+
 Version 1.0.2
 -------------