Fix redirect bug in VkApi.security_check

Author: python273

vk_api/vk_api.py

@@ -78,7 +78,7 @@ def __init__(self, login=None, password=None, number=None, token=None,
             if not self.check_sid():
                 self.vk_login()
             else:
-                self.security_check('http://vk.com')
+                self.security_check('https://vk.com/')
 
             if not self.check_token():
                 self.api_login()