Change default config filename

Author: python273

vk_api/vk_api.py

@@ -51,6 +51,9 @@ def __init__(self, login=None, password=None, number=None, token=None,
         self.app_id = app_id
         self.scope = scope
 
+        if not config_filename:
+            config_filename = 'vk_config.json'
+
         self.settings = jconfig.Config(login, filename=config_filename)
 
         self.http = requests.Session()