Bump psycopg2-binary from 2.8.3 to 2.8.4

Bumps [psycopg2-binary](https://github.com/psycopg/psycopg2) from 2.8.3 to 2.8.4.
- [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

@@ -29,7 +29,7 @@ oauthlib==3.1.0
 # olefile==0.46
 # pandas==0.23.4
 Pillow==6.1.0
-psycopg2-binary==2.8.3
+psycopg2-binary==2.8.4
 pyIsEmail==1.3.2
 # pyOpenSSL==18.0.0
 python3-linkedin==1.0.2