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* Move license from ISC to MIT License.
* Always send ``isBase64Encoded`` in responses, as per the AWS documentation.
* Support `format version
2 <https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-develop-integrations-lambda.html>`,
which was introduced by API Gateway for “HTTP API's”
(`Issue 124 <https://github.com/adamchainz/apig-wsgi/pull/124>`__)..
* ``binary_support`` now defaults to ``None``, which means that it will
automatically enable binary support for format version 2 events.