updating license wording from 'gpl compatitible' to 'gpl friendly

src/license.html

@@ -13,7 +13,7 @@ relative_path: ../
 <div class="container">
   {% capture stripe_ad_content %}
   <p class="lead">
-    Font Awesome is fully open source and is GPL compatible. You can use it for commercial projects, open source
+    Font Awesome is fully open source and is GPL friendly. You can use it for commercial projects, open source
     projects, or really just about whatever you want.
   </p>
   {% endcapture %}