Chores
- Black update and reformat ([166](https://github.com/crypkit/blockapi/pull/166),
[`1dfc448`](https://github.com/crypkit/blockapi/commit/1dfc4482d90bb6b9a683140303c4c157816c5306))
Features
- Support multiple OpenSea blockchains ([165](https://github.com/crypkit/blockapi/pull/165),
[`657d697`](https://github.com/crypkit/blockapi/commit/657d69762b63ce4bc6be027befaa87e145917658))