Update version and changelog.

Author: T4rk1n

Diff for: CHANGELOG.md

@@ -1,3 +1,8 @@
+## 0.23.1 - 2018-08-02
+## Added
+- Add ie-compat meta tag to the index by default. [#316](https://github.com/plotly/dash/pull/316)
+- Add `external_script` and `external_css` keywords to dash `__init__`. [#305](https://github.com/plotly/dash/pull/305)
+
 ## 0.23.0 - 2018-08-01
 ## Added
 - Dash components are now generated at build-time and then imported rather than generated when a module is imported. This should reduce the time it takes to import Dash component libraries, and makes Dash compatible with IDEs.

Diff for: dash/version.py

@@ -1 +1 @@
-__version__ = '0.23.0'
+__version__ = '0.23.1'