Update factory_boy to 2.10.0

[pyup-bot]

There's a new version of factory_boy available.
You are currently using 2.9.2. I have updated it to 2.10.0

These links might come in handy: PyPI | Changelog | Repo

Changelog

2.10.0

---

Bugfix:

• :issue:443: Don't crash when calling :meth:factory.Iterator.reset() on a brand new iterator.

New:

• :issue:397: Allow a :class:factory.Maybe to contain a :class:~factory.PostGenerationDeclaration.
  This also applies to :class:factory.Trait, since they use a :class:factory.Maybe declaration internally.

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[coveralls]

Coverage remained the same at 100.0% when pulling b23cc7b on pyup-update-factory_boy-2.9.2-to-2.10.0 into 4079242 on master.