Fixed small merge error.

public/index.html

@@ -10,7 +10,7 @@
     -->
     <link rel="manifest" href="%PUBLIC_URL%/manifest.json">
     <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
-    <link rel="stylesheet" type="text/css" href="//fonts.googleapis.com/css?family=Nunito" />
+    <link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">
     <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.40.1/mapbox-gl.css' rel='stylesheet' />
     <!--
       Notice the use of %PUBLIC_URL% in the tags above.