Artem

Fix Choices docstring

1

Fixes #53

PyCharm code inspection highlights all choices. Example: ```python STATES = Choices( ('ONLINE', 1, 'Online'), ('DRAFT', 2, 'Draft'), ('OFFLINE', 3, 'Offline'), ) ``` Inspection info: `Expected type 'list', got 'Tuple[str, int,...

Back reference filter

4

What need to do for allow query like this ``` query { authors (filters: {book_set__name: "bar1"}){ edges { node { id name book_set { edges { node { id name...

Some schema may be created like normal or relay: normal: ```graphql { allUsers { id username } } ``` relay: ```graphql { allUsers { edges { node { id username...