Fix incorrect upstream remote URL in Upgrading doc

- Close #287

_docs/04-upgrading.md

@@ -2,7 +2,7 @@
 title: "Upgrading"
 permalink: /docs/upgrading/
 excerpt: "Instructions and suggestions for upgrading the theme."
-modified: 2016-04-13T15:54:02-04:00
+modified: 2016-04-27T10:35:00-04:00
 ---
 
 {% include base_path %}
@@ -18,7 +18,7 @@ To double check, run `git remote -v` and verify that you can fetch from `origin
 To add it you can do the following:
 
 ```bash
-$ git remote add upstream {{ site.gh_repo }}/minimal-mistakes.git
+$ git remote add upstream https://github.com/mmistakes/minimal-mistakes.git
 ```
 
 ### Pull Down Updates

_docs/05-configuration.md

@@ -2,7 +2,7 @@
 title: "Configuration"
 permalink: /docs/configuration/
 excerpt: "Settings for configuring and customizing the theme."
-modified: 2016-04-14
+modified: 2016-04-27T10:35:10-04:00
 ---
 
 {% include base_path %}

_docs/07-ui-text.md

@@ -2,7 +2,7 @@
 title: "UI Text"
 permalink: /docs/ui-text/
 excerpt: "Text for customizing various user interface elements found in the theme."
-modified: 2016-04-13T15:54:02-04:00
+modified: 2016-04-27T10:35:05-04:00
 ---
 
 {% include base_path %}