Update fieldwork.html

Author: GeospatialPython

fieldwork.html

@@ -58,7 +58,7 @@ <h3>Field Data Collection Example</h3>
 var lat = 0;
 var lon = 0;
 
-L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
+L.tileLayer('https://{s}.tile.osm.org/{z}/{x}/{y}.png', {
     maxZoom: 18,
     attribution: 'Map data &copy; <a href="http://openstreetmap.org">OpenStreetMap</a> contributors, ' +
         '<a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, ' +