Add note about updating Gemfile when forking theme

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ### Enhancements
 
+* Add documentation note to update root `Gemfile` when forking theme.
 * Add missing French translations. [#1741](https://github.com/mmistakes/minimal-mistakes/pull/1741)
 
 ## [4.12.0](https://github.com/mmistakes/minimal-mistakes/releases/tag/4.12.0)

docs/_docs/01-quick-start-guide.md

@@ -2,7 +2,7 @@
 title: "Quick-Start Guide"
 permalink: /docs/quick-start-guide/
 excerpt: "How to quickly install and setup Minimal Mistakes for use with GitHub Pages."
-last_modified_at: 2018-03-20T15:58:49-04:00
+last_modified_at: 2018-07-19T11:25:25-04:00
 redirect_from:
   - /theme-setup/
 toc: true
@@ -96,6 +96,9 @@ If you forked or downloaded the `minimal-mistakes-jekyll` repo you can safely re
 - `screenshot-layouts.png`
 - `screenshot.png`
 
+**Note:** If forking the theme be sure to update `Gemfile` as well. The one found at the root of the project is for building the theme's Ruby gem and is missing dependencies. To properly setup a [`Gemfile`](https://github.com/mmistakes/minimal-mistakes/blob/master/docs/Gemfile) with the theme, consult the "[Install Dependencies](https://mmistakes.github.io/minimal-mistakes/docs/installation/)" section.
+{: .notice--warning}
+
 ## Setup Your Site
 
 Depending on the path you took installing Minimal Mistakes you'll setup things a little differently.

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: 2018-07-10T16:00:16-04:00
+last_modified_at: 2018-07-19T11:26:24-04:00
 toc: true
 ---
 
@@ -12,6 +12,7 @@ toc: true
 
 ### Enhancements
 
+* Add documentation note to update root `Gemfile` when forking theme.
 * Add missing French translations. [#1741](https://github.com/mmistakes/minimal-mistakes/pull/1741)
 
 ## [4.12.0](https://github.com/mmistakes/minimal-mistakes/releases/tag/4.12.0)