Update CHANGELOG

Author: mmistakes

CHANGELOG.md

@@ -10,6 +10,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Changed
 - Update GitHub issue templates.
 
+### Fixed
+- Add missing `/` in icon-gitlab.html. [#80](https://github.com/mmistakes/jekyll-theme-basically-basic/pull/80)
+
 ## [1.4.1] - 2018-08-07
 
 ### Added