Bump psycopg2-binary from 2.8.2 to 2.8.3

Bumps [psycopg2-binary](https://github.com/psycopg/psycopg2) from 2.8.2 to 2.8.3.
- [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-preview[bot] <support@dependabot.com>

requirements.txt

@@ -21,7 +21,7 @@ lxml==4.3.3
 markdown==3.1.1
 maya==0.6.1
 Pillow==6.1.0
-psycopg2-binary==2.8.2
+psycopg2-binary==2.8.3
 python-dateutil==2.8.0
 pytz==2019.1
 requests==2.22.0