Update history and bump version to 3.1.5

_docs/17-history.md

@@ -4,9 +4,21 @@ permalink: /docs/history/
 excerpt: "Changelog of enhancements and bug fixes made to the theme."
 sidebar:
   nav: docs
-modified: 2016-04-27T11:15:01-04:00
+modified: 2016-05-02T11:57:25-04:00
 ---
 
+## [3.1.5](https://github.com/mmistakes/minimal-mistakes/releases/tag/3.1.5)
+
+### Maintenance
+
+- Fix `www` and `https` links in author profile include [#293](https://github.com/mmistakes/minimal-mistakes/pull/293)
+
+## [3.1.4](https://github.com/mmistakes/minimal-mistakes/releases/tag/3.1.4)
+
+### Enhancements
+
+- Add `overlay_filter` param to hero headers [#298](https://github.com/mmistakes/minimal-mistakes/pull/298)
+
 ## [3.1.3](https://github.com/mmistakes/minimal-mistakes/releases/tag/3.1.3)
 
 ### Enhancements

_pages/home.md

@@ -8,7 +8,7 @@ header:
   cta_label: "<i class='fa fa-download'></i> Install Now"
   cta_url: "/docs/quick-start-guide/"
   caption:
-excerpt: 'A flexible two-column Jekyll theme. Perfect for personal sites, blogs, and portfolios hosted on GitHub or your own server.<br /> <small>Currently at version 3.1.3</small><br /><br /> {::nomarkdown}<iframe style="display: inline-block;" src="https://ghbtns.com/github-btn.html?user=mmistakes&repo=minimal-mistakes&type=star&count=true&size=large" frameborder="0" scrolling="0" width="160px" height="30px"></iframe> <iframe style="display: inline-block;" src="https://ghbtns.com/github-btn.html?user=mmistakes&repo=minimal-mistakes&type=fork&count=true&size=large" frameborder="0" scrolling="0" width="158px" height="30px"></iframe>{:/nomarkdown}'
+excerpt: 'A flexible two-column Jekyll theme. Perfect for personal sites, blogs, and portfolios hosted on GitHub or your own server.<br /> <small>Currently at version 3.1.5</small><br /><br /> {::nomarkdown}<iframe style="display: inline-block;" src="https://ghbtns.com/github-btn.html?user=mmistakes&repo=minimal-mistakes&type=star&count=true&size=large" frameborder="0" scrolling="0" width="160px" height="30px"></iframe> <iframe style="display: inline-block;" src="https://ghbtns.com/github-btn.html?user=mmistakes&repo=minimal-mistakes&type=fork&count=true&size=large" frameborder="0" scrolling="0" width="158px" height="30px"></iframe>{:/nomarkdown}'
 feature_row:
   - image_path: mm-customizable-feature.png
     alt: "customizable"