Update CHANGELOG and history

Author: mmistakes

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ### Enhancements
 
+- Improve accessibility of `default` skin by increasing color contrast of text and links.
 - Hide posts with `hidden: true` YAML front matter from appearing in listings. [#2345](https://github.com/mmistakes/minimal-mistakes/pull/2345)
 - Add Irish (Gaeilge) localized UI text strings. [#2422](https://github.com/mmistakes/minimal-mistakes/pull/2422)
 - Remove `box-shadow` on radio and checkbox inputs. [#2398](https://github.com/mmistakes/minimal-mistakes/pull/2398)

docs/_docs/18-history.md

@@ -5,14 +5,15 @@ permalink: /docs/history/
 excerpt: "Change log of enhancements and bug fixes made to the theme."
 sidebar:
   nav: docs
-last_modified_at: 2020-03-04T16:10:49-05:00
+last_modified_at: 2020-03-04T16:35:36-05:00
 toc: false
 ---
 
 ## Unreleased
 
 ### Enhancements
 
+- Improve accessibility of `default` skin by increasing color contrast of text and links.
 - Hide posts with `hidden: true` YAML front matter from appearing in listings. [#2345](https://github.com/mmistakes/minimal-mistakes/pull/2345)
 - Add Irish (Gaeilge) localized UI text strings. [#2422](https://github.com/mmistakes/minimal-mistakes/pull/2422)
 - Remove `box-shadow` on radio and checkbox inputs. [#2398](https://github.com/mmistakes/minimal-mistakes/pull/2398)