Update sanitize function to use https instead of http

depositor/b2share.py

@@ -255,8 +255,8 @@ def sanitize_api_url(url):
 
     :type url: string
     """
-    if not url.startswith('http'):
-        url = 'http://' + url
+    if not url.startswith('https'):
+        url = 'https://' + url
     b2share_url = furl(url)
     if 'api' not in str(b2share_url.path):
         b2share_url.path.add('api/')