Fix https error on Windows

yellow-sky · yellow-sky · commit 7331b781b53c · 2015-06-26T15:50:44.000+03:00
diff --git a/data_sources/mapbox_gray/metadata.ini b/data_sources/mapbox_gray/metadata.ini
@@ -16,5 +16,5 @@ copyright_link =
 terms_of_use = 
 
 [tms]
-url = https://a.tiles.mapbox.com/v3/examples.map-20v6611k/{z}/{x}/{y}.png
+url = http://a.tiles.mapbox.com/v3/examples.map-20v6611k/{z}/{x}/{y}.png
 zmax = 19
