Fix broken FAQ link

client/index.html

@@ -141,7 +141,7 @@
                         <use xlink:href="#twitter" />
                     </svg>
                 </a>
-                <a class="icon-button" target="_blank" href="https://github.com/RobinLinus/snapdrop/docs/faq.md" title="Frequently asked questions" rel="noreferrer">
+                <a class="icon-button" target="_blank" href="https://github.com/RobinLinus/snapdrop/blob/master/docs/faq.md" title="Frequently asked questions" rel="noreferrer">
                     <svg class="icon">
                         <use xlink:href="#help-outline" />
                     </svg>
@@ -218,4 +218,4 @@
         }
         </style>
     </noscript>
-</body>
+</body>