Add styling for GFM task lists

Close #2092

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ### Enhancements
 
+- Add styling for [GFM task lists](https://help.github.com/en/articles/about-task-lists#creating-task-lists). [#2092](https://github.com/mmistakes/minimal-mistakes/issues/2092)
 - Update Google Universal Analytics to load async. [#2079](https://github.com/mmistakes/minimal-mistakes/pull/2079)
 - Remove Google+ social sharing button, comment provider, and author link configs from theme.
 - Add missing Chinese text strings. [#2072](https://github.com/mmistakes/minimal-mistakes/pull/2072)

_sass/minimal-mistakes/_utilities.scss

@@ -103,6 +103,23 @@ body:hover .visually-hidden button {
   white-space: nowrap;
 }
 
+/*
+   Task lists
+   ========================================================================== */
+
+.task-list {
+  padding:0;
+
+  li {
+    list-style-type: none;
+  }
+
+  .task-list-item-checkbox {
+    margin-right: 0.5em;
+    opacity: 1;
+  }
+}
+
 /*
    Alignment
    ========================================================================== */

docs/_docs/18-history.md

@@ -5,7 +5,7 @@ permalink: /docs/history/
 excerpt: "Change log of enhancements and bug fixes made to the theme."
 sidebar:
   nav: docs
-last_modified_at: 2019-03-05T18:56:32-05:00
+last_modified_at: 2019-03-13T08:30:09-04:00
 toc: false
 ---
 
@@ -13,6 +13,7 @@ toc: false
 
 ### Enhancements
 
+- Add styling for [GFM task lists](https://help.github.com/en/articles/about-task-lists#creating-task-lists). [#2092](https://github.com/mmistakes/minimal-mistakes/issues/2092)
 - Update Google Universal Analytics to load async. [#2079](https://github.com/mmistakes/minimal-mistakes/pull/2079)
 - Remove Google+ social sharing button, comment provider, and author link configs from theme.
 - Add missing Chinese text strings. [#2072](https://github.com/mmistakes/minimal-mistakes/pull/2072)

test/_posts/2009-05-15-edge-case-nested-and-mixed-lists.md

@@ -58,3 +58,9 @@ Nested and mixed lists are an interesting beast. It's a corner case to make sure
     2. **ordered item**
 * unordered item
 * unordered item
+
+### Task Lists
+
+- [x] Finish my changes
+- [ ] Push my commits to GitHub
+- [ ] Open a pull request