Bump pyyaml from 3.11 to 3.13
Bump pyyaml from 3.11 to 3.13

Bumps [pyyaml](http://pyyaml.org/wiki/PyYAML) from 3.11 to 3.13.

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
DemocracyClub/yournextrepresentative,DemocracyClub/yournextrepresentative,DemocracyClub/yournextrepresentative