Update CHANGELOG and history

CHANGELOG.md

@@ -12,6 +12,7 @@
 * Fix code block extra white-space when using [Jekyll's highlight tag](https://jekyllrb.com/docs/templates/#code-snippet-highlighting) with `linenos`. [#1437](https://github.com/mmistakes/minimal-mistakes/issues/1437)
 * Round top-right corner of code block icon.
 * Remove Lunr.js trimmer and bring back colons. [#1445](https://github.com/mmistakes/minimal-mistakes/pull/1445)
+* Fix sticky `.sidebar` that overlaps main content when resizing viewport. [#1447](https://github.com/mmistakes/minimal-mistakes/issues/1447)
 
 ## [4.8.1](https://github.com/mmistakes/minimal-mistakes/releases/tag/4.8.1)
 

docs/_docs/18-history.md

@@ -4,7 +4,7 @@ permalink: /docs/history/
 excerpt: "Change log of enhancements and bug fixes made to the theme."
 sidebar:
   nav: docs
-last_modified_at: 2018-01-03T12:47:55-05:00
+last_modified_at: 2018-01-03T14:21:37-05:00
 toc: true
 ---
 
@@ -22,6 +22,7 @@ toc: true
 * Fix code block extra white-space when using [Jekyll's highlight tag](https://jekyllrb.com/docs/templates/#code-snippet-highlighting) with `linenos`. [#1437](https://github.com/mmistakes/minimal-mistakes/issues/1437)
 * Round top-right corner of code block icon.
 * Remove Lunr.js trimmer and bring back colons. [#1445](https://github.com/mmistakes/minimal-mistakes/pull/1445)
+* Fix sticky `.sidebar` that overlaps main content when resizing viewport. [#1447](https://github.com/mmistakes/minimal-mistakes/issues/1447)
 
 ## [4.8.1](https://github.com/mmistakes/minimal-mistakes/releases/tag/4.8.1)