changed urls to cache

serviceWorker.js

@@ -2,6 +2,7 @@
 var APP_SHELL_VERSION = 2;
 var APP_SHELL_CACHE = `inventur_shell-v${APP_SHELL_VERSION}`;
 var urlsToCache = [
+    './',
     'css/lib/materialize.min.css',
     'js/lib/materialize.min.js',
     'js/lib/accounting.min.js',
@@ -10,7 +11,6 @@ var urlsToCache = [
     'js/lib/vue-dev.js',
     'js/lib/vue.min.js',
     'js/lib/vue-resource.min.js',
-    'fonts/Roboto/*',
     'data/articles.json'
 ];