made it possible to import VkApiGroup (#453)

Co-authored-by: Ruslan <kornerus@fjfi.cvut.cz>

Author: ruslan-korneev

vk_api/__init__.py

@@ -10,7 +10,7 @@
 from .requests_pool import VkRequestsPool, vk_request_one_param_pool
 from .tools import VkTools
 from .upload import VkUpload
-from .vk_api import VkApi
+from .vk_api import VkApi, VkApiGroup
 
 
 __author__ = 'python273'