Fix github link font

Author: cedricss

CHANGELOG.md

@@ -6,6 +6,7 @@
 ## 1.3 (May 7, 2016)
 
 - New support of syntax highlighting in code blocks
+- Fix github link font
 
 ## 1.2 (Jan 17, 2016)
 

_layouts/index.html

@@ -13,7 +13,7 @@
             </nav>
             <section>
                 <div id="contribute">
-                    <a href="{{ site.repository }}/blob/{{ site.branch }}/{{ page.path }}" class="fa fa-github"> Contribute to this page</a>
+                    <a href="{{ site.repository }}/blob/{{ site.branch }}/{{ page.path }}"><span class="fa fa-github"> </span> Contribute to this page</a>
                 </div>
                 {{ content }}
             </section>