Bump python-engineio from 1.0.3 to 3.8.2.post1 in /app

Bumps [python-engineio](https://github.com/miguelgrinberg/python-engineio) from 1.0.3 to 3.8.2.post1.
- [Release notes](https://github.com/miguelgrinberg/python-engineio/releases)
- [Changelog](https://github.com/miguelgrinberg/python-engineio/blob/master/CHANGES.md)
- [Commits](https://github.com/miguelgrinberg/python-engineio/commits)

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

app/requirements.txt

@@ -13,7 +13,7 @@ MarkupSafe==0.23
 numpy==1.11.1
 pandas==0.18.1
 python-dateutil==2.5.3
-python-engineio==1.0.3
+python-engineio==3.8.2.post1
 python-socketio==1.6.0
 pytz==2016.6.1
 pyyaml>=4.2b1