Bump psycopg2 from 2.7.6.1 to 2.8.2

Bumps [psycopg2](https://github.com/psycopg/psycopg2) from 2.7.6.1 to 2.8.2.
- [Release notes](https://github.com/psycopg/psycopg2/releases)
- [Changelog](https://github.com/psycopg/psycopg2/blob/master/NEWS)
- [Commits](https://github.com/psycopg/psycopg2/commits)

Signed-off-by: dependabot[bot] <support@dependabot.com>

test-requirements.txt

@@ -7,4 +7,4 @@ celery==3.1.25
 django-celery==3.2.2
 flake8==3.6.0
 requests==2.20.1
-psycopg2==2.7.6.1
+psycopg2==2.8.2