bump version to 2.0.0b3, update changelog.rst

docs/changelog.rst

@@ -7,6 +7,14 @@ For full details of the Locust changelog, please see https://github.com/locustio
 2.0.0
 =====
 
+This version contains some potentially breaking changes for existing test plans/setups:
+* User ramp up/down and User type selection is now controlled by the master instead of autonomously by the workers. This fixes some issues with unbalanced user distribution (#1618) and also uneven ramp up steps (#896), especially when there were many workers. This is a big change internally in Locust so there might still be some issues, please file a ticket if you encounter something that worked previously and you think might be related https://github.com/locustio/locust/pull/1621, https://github.com/locustio/locust/pull/1809
+* Change the default User weight to 1 instead of 10 (because the old default made no sense) https://github.com/locustio/locust/pull/1803
+* Fire test_start and test_stop events on workers too (previously they were only fired on master/standalone instances) https://github.com/locustio/locust/pull/1777/
+* Update Flask dependency to 2.0 https://github.com/locustio/locust/pull/1764
+
+Merged PR:s (and prerelease version they were introduced in)
+* Fire test_start and test_stop events on worker nodes https://github.com/locustio/locust/pull/1777/ (2.0.0b3)
 * Auto shrink request stats table to fit terminal https://github.com/locustio/locust/pull/1811 (2.0.0b2)
 * Refactoring of the dispatch logic to improve performance https://github.com/locustio/locust/pull/1809 (2.0.0b2)
 * Check version of workers when they connect. Warn if there is a mismatch, refuse 1.x workers to connect https://github.com/locustio/locust/pull/1805 (2.0.0b1)

locust/__init__.py

@@ -1,4 +1,4 @@
-__version__ = "2.0.0b2"
+__version__ = "2.0.0b3"
 
 from gevent import monkey