feat(package): release v0.8.0 (#662)

## Change Summary

Please summarise the changes this pull request is making here.

## Checklist

- [ ] Unit tests for the changes exist
- [ ] Tests pass without significant drop in coverage
- [ ] Documentation reflects changes where applicable
- [ ] Test snapshots have been
[updated](https://prisma-client-py.readthedocs.io/en/latest/contributing/contributing/#snapshot-tests)
if applicable

## Agreement

By submitting this pull request, I confirm that you can use, modify,
copy and redistribute this contribution, under the terms of your choice.

src/prisma/__init__.py

@@ -4,7 +4,7 @@
 __author__ = 'RobertCraigie'
 __license__ = 'APACHE'
 __copyright__ = 'Copyright 2020-2021 RobertCraigie'
-__version__ = '0.8.0a'
+__version__ = '0.8.0'
 
 from typing import TYPE_CHECKING