Bump Flask from 0.10 to 0.12.2
Bump Flask from 0.10 to 0.12.2

Bumps [Flask](https://github.com/pallets/flask) from 0.10 to 0.12.2.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/master/docs/changelog.rst)
- [Commits](https://github.com/pallets/flask/compare/0.10...0.12.2)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
phil-r/asciifacesbot