Update CHANGELOG

Author: mmistakes

CHANGELOG.md

@@ -1,3 +1,14 @@
+## [3.1.2](https://github.com/mmistakes/minimal-mistakes/releases/tag/3.1.2)
+
+### Enhancement
+
+- Explain how to use `nav_list` helper in [documentation](https://mmistakes.github.io/minimal-mistakes/docs/helpers/#navigation-list).
+- Reduce left/right padding on smaller screens to increase width of main content column.
+
+### Bug Fixes
+
+- Fix alignment issues with related posts [#273](https://github.com/mmistakes/minimal-mistakes/issues/273) and "Follow" button in author profile [#274](https://github.com/mmistakes/minimal-mistakes/issues/274).
+
 ## [3.1.1](https://github.com/mmistakes/minimal-mistakes/releases/tag/3.1.1)
 
 ### Bug Fix