Bump flask from 2.1.1 to 2.1.2

Bumps [flask](https://github.com/pallets/flask) from 2.1.1 to 2.1.2.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](https://github.com/pallets/flask/compare/2.1.1...2.1.2

)

---
updated-dependencies:
- dependency-name: flask
  dependency-type: direct:production
  update-type: version-update:semver-patch
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Bump pytest from 7.1.1 to 7.1.2

Bumps [pytest](https://github.com/pytest-dev/pytest) from 7.1.1 to 7.1.2.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/7.1.1...7.1.2

)

---
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  dependency-type: direct:production
  update-type: version-update:semver-patch
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Bump more-itertools from 6.0.0 to 8.12.0

Bumps [more-itertools](https://github.com/more-itertools/more-itertools) from 6.0.0 to 8.12.0.
- [Release notes](https://github.com/more-itertools/more-itertools/releases)
- [Commits](https://github.com/more-itertools/more-itertools/compare/6.0.0...v8.12.0

)

---
updated-dependencies:
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  update-type: version-update:semver-major
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Bump flask-caching from 1.4.0 to 1.10.1

Bump pytest from 4.3.0 to 7.1.2

Bumps [flask-caching](https://github.com/sh4nks/flask-caching) from 1.4.0 to 1.10.1.
- [Release notes](https://github.com/sh4nks/flask-caching/releases)
- [Changelog](https://github.com/pallets-eco/flask-caching/blob/master/CHANGES.rst)
- [Commits](https://github.com/sh4nks/flask-caching/compare/v1.4.0...v1.10.1

)

---
updated-dependencies:
- dependency-name: flask-caching
  dependency-type: direct:production
  update-type: version-update:semver-minor
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Bumps [pytest](https://github.com/pytest-dev/pytest) from 4.3.0 to 7.1.2.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/4.3.0...7.1.2

)

---
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- dependency-name: pytest
  dependency-type: direct:production
  update-type: version-update:semver-major
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Add event colour support (see #52)

Bump py from 1.8.0 to 1.10.0

This change is untested and therefore needs confirmatory testing before being merged!

Bumps [py](https://github.com/pytest-dev/py) from 1.8.0 to 1.10.0.
- [Release notes](https://github.com/pytest-dev/py/releases)
- [Changelog](https://github.com/pytest-dev/py/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/py/compare/1.8.0...1.10.0

)

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Bump jinja2 from 2.10 to 2.11.3

Bumps [jinja2](https://github.com/pallets/jinja) from 2.10 to 2.11.3.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/master/CHANGES.rst)
- [Commits](https://github.com/pallets/jinja/compare/2.10...2.11.3

)

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Bump pyyaml from 3.13 to 5.4

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 3.13 to 5.4.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](https://github.com/yaml/pyyaml/compare/3.13...5.4

)

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Bump Python version for Heroku

Fixes #78