Remove deprecated base_path include helper

docs/_docs/02-structure.md

@@ -20,7 +20,6 @@ minimal-mistakes
 |  ├── comments-providers      # snippets for comments (Disqus, Facebook, Google+, and custom)
 |  ├── footer                  # custom snippets to add to site footer
 |  ├── head                    # custom snippets to add to site head
-|  ├── base_path               # site.url + site.baseurl shortcut
 |  ├── feature_row             # feature row helper
 |  ├── gallery                 # image gallery helper
 |  ├── group-by-array          # group by array helper for archives

docs/_docs/14-helpers.md

@@ -38,15 +38,6 @@ toc_icon: "cogs"
 
 You can think of these Jekyll helpers as little shortcuts. Since GitHub Pages doesn't allow most plugins --- [custom tags](https://jekyllrb.com/docs/plugins/#tags) are out. Instead the theme leverages [**includes**](https://jekyllrb.com/docs/templates/#includes) to do something similar.
 
-## Base Path
-
-**Deprecated**. Use `relative_url` filter instead.
-
-Instead of repeating `{% raw %}{{ site.url }}{{ site.baseurl }}{% endraw %}` over and over again to create absolute URLs, you can use `{% raw %}{{ base_path }}{% endraw %}` instead. Simply add `{% raw %}{% include base_path %}{% endraw %}` to layouts, posts, pages, collections, or other includes and you're good to go.
-
-**ProTip:** It's a good practice to use absolute URL paths for assets (especially post images) so they correctly resolve in the site's XML feeds. Example: `{% raw %}{{ "/assets/images/filename.jpg" | relative_url }}{% endraw %}` ~> `https://yourdoamin.com/assets/images/filename.jpg`
-{: .notice--info}
-
 ## Group by Array
 
 [Jekyll Group-By-Array](https://github.com/mushishi78/jekyll-group-by-array) by Max White.

docs/_docs/18-history.md

@@ -4,10 +4,16 @@ permalink: /docs/history/
 excerpt: "Change log of enhancements and bug fixes made to the theme."
 sidebar:
   nav: docs
-last_modified_at: 2018-09-10T19:36:45-04:00
+last_modified_at: 2018-09-11T09:58:11-04:00
 toc: true
 ---
 
+## Unreleased
+
+### Enhancements
+
+- Remove deprecated `base_path` include helper.
+
 ## [4.13.0](https://github.com/mmistakes/minimal-mistakes/releases/tag/4.13.0)
 
 ### Enhancements