Update CHANGELOG and history

Author: mmistakes

CHANGELOG.md

@@ -1,3 +1,9 @@
+## Unreleased
+
+### Bug Fixes
+
+- Fix typo in `_config.yml`. [#2319](https://github.com/mmistakes/minimal-mistakes/pull/2319)
+
 ## [4.17.2](https://github.com/mmistakes/minimal-mistakes/releases/tag/4.17.2)
 
 ### Enhancements

docs/_docs/18-history.md

@@ -5,10 +5,16 @@ permalink: /docs/history/
 excerpt: "Change log of enhancements and bug fixes made to the theme."
 sidebar:
   nav: docs
-last_modified_at: 2019-11-07T11:52:18-05:00
+last_modified_at: 2019-11-12T15:01:27-05:00
 toc: false
 ---
 
+## Unreleased
+
+### Bug Fixes
+
+- Fix typo in `_config.yml`. [#2319](https://github.com/mmistakes/minimal-mistakes/pull/2319)
+
 ## [4.17.2](https://github.com/mmistakes/minimal-mistakes/releases/tag/4.17.2)
 
 ### Enhancements