update all cdn version numbers

add-search-to-a-map.md

@@ -157,8 +157,8 @@ Your index.html should look something like this:
   <meta charset="utf-8">
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.5/leaflet.css">
   <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.5/leaflet.js"></script>
-  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet-geocoder-mapzen/1.3.0/leaflet-geocoder-mapzen.css">
-  <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet-geocoder-mapzen/1.3.0/leaflet-geocoder-mapzen.js"></script>
+  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet-geocoder-mapzen/1.4.0/leaflet-geocoder-mapzen.css">
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet-geocoder-mapzen/1.4.0/leaflet-geocoder-mapzen.js"></script>
   <style>
     #map {
       height: 100%;
@@ -254,7 +254,7 @@ You can refer to this HTML if you want to review your work or troubleshoot an er
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.5/leaflet.css">
   <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.5/leaflet.js"></script>
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet-geocoder-mapzen/1.4.0/leaflet-geocoder-mapzen.css">
-  <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet-geocoder-mapzen/1.34.0/leaflet-geocoder-mapzen.js"></script>
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet-geocoder-mapzen/1.4.0/leaflet-geocoder-mapzen.js"></script>
   <style>
     #map {
       height: 100%;