Merge pull request #314 from rmarren1/273-bump-version

Update changelog and version for #273

Author: rmarren1

Diff for: CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.22.1 - 2018-08-01
+## Fixed
+- Raise a more informative error if a non JSON serializable value is returned from a callback [#273](https://github.com/plotly/dash/pull/273)
+
 ## 0.22.0 - 2018-07-25
 ## Added
 - Assets files & index customization [#286](https://github.com/plotly/dash/pull/286)

Diff for: dash/version.py

@@ -1 +1 @@
-__version__ = '0.22.0'
+__version__ = '0.22.1'