adding appstore link

Author: Jhonny Michel

src/templates/partials/header.html

@@ -95,9 +95,9 @@ <h1>Menu</h1>
           <a target="_blank" href="https://play.google.com/store/apps/details?id=org.pythonbrasil.pybr2018">
               <img src="${require('img/google-play-badge.png')}" alt="Baixe no Google Play">
           </a>
-          <!-- a target="_blank" href="https://play.google.com/store/apps/details?id=org.pythonbrasil.pybr2018">
+          <a target="_blank" href="https://itunes.apple.com/us/app/python-brasil-2018/id1439521365?ls=1&mt=8">
               <img  class="apple" src="${require('img/download-on-appstore.svg')}" alt="Baixe na AppStore">
-          </a -->
+          </a>
         </div>
     </div>
     <section id="page-content" class="page-content">