Update fontawesome to v5.11.2 in default layout. (#236)

CONTRIBUTORS.md

@@ -47,3 +47,4 @@
 - [Luis Zarate](https://github.com/jlzaratec)
 - [Ariejan de Vroom](https://www.devroom.io)
 - [Bobby Lindsey](https://bobbywlindsey.com)
+- [José Mª Escartín](https://github.com/jme52)

layouts/_default/baseof.html

@@ -22,7 +22,7 @@
     {{ end }}
 
     <link href="https://fonts.googleapis.com/css?family=Lato:400,700%7CMerriweather:300,700%7CSource+Code+Pro:400,700" rel="stylesheet">
-    <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.1/css/all.css" integrity="sha384-50oBUHEmvpQ+1lW4y57PTFmhCaXp0ML5d60M1M7uH2+nqUivzIebhndOJK28anvf" crossorigin="anonymous" />
+    <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.11.2/css/all.css" integrity="sha384-KA6wR/X5RY4zFAHpv/CnoG2UW1uogYfdnP67Uv7eULvTveboZJg0qUpmJZb5VqzN" crossorigin="anonymous" />
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/8.0.1/normalize.min.css" integrity="sha256-l85OmPOjvil/SOvVt3HnSSjzF1TUMyT9eV0c2BzEGzU=" crossorigin="anonymous" />
 
     {{ if .Site.IsServer }}