Update README.md

Author: Znerox

README.md

@@ -1,5 +1,5 @@
-![](http://i.imgur.com/FJBoO1a.png)
-[Live version](http://wifikart.net) (you may need to allow "insecure content", some elements over http)
+![](https://i.imgur.com/ICOMUfd.png)
+[Live version](https://wifikart.net) (you may need to allow "insecure content", some elements over http)
 
 # WiFi Map
 Makes data generated by WiGLE Android app searchable (with filters) and overlays it on Google Maps.