Change to https as http is no longer supported on overpass-api.de

Author: jose1711

overpass/api.py

@@ -12,7 +12,7 @@ class API(object):
 
     # defaults for the API class
     _timeout = 25  # seconds
-    _endpoint = "http://overpass-api.de/api/interpreter"
+    _endpoint = "https://overpass-api.de/api/interpreter"
     _debug = False
 
     _QUERY_TEMPLATE = "[out:{out}];{query}out {verbosity};"