Bump memoist from 0.15.0 to 0.16.0
Bump memoist from 0.15.0 to 0.16.0

Bumps [memoist](https://github.com/matthewrudy/memoist) from 0.15.0 to 0.16.0.
- [Commits](https://github.com/matthewrudy/memoist/compare/v0.15.0...v0.16.0)
openpolitics/votebot,openpolitics/votebot,openpolitics/votebot