chore(deps): update dependency m2r2 to v0.3.2 (#303)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [m2r2](https://togithub.com/crossnox/m2r2) | `==0.2.8` -> `==0.3.2` |
[![age](https://badges.renovateapi.com/packages/pypi/m2r2/0.3.2/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://badges.renovateapi.com/packages/pypi/m2r2/0.3.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/pypi/m2r2/0.3.2/compatibility-slim/0.2.8)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/pypi/m2r2/0.3.2/confidence-slim/0.2.8)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>crossnox/m2r2 (m2r2)</summary>

###
[`v0.3.2`](https://togithub.com/crossnox/m2r2/blob/HEAD/CHANGES.md#Version-032-2021-12-10)

[Compare
Source](https://togithub.com/crossnox/m2r2/compare/v0.3.1...v0.3.2)

-   Pin mistune version

###
[`v0.3.1`](https://togithub.com/crossnox/m2r2/blob/HEAD/CHANGES.md#Version-031-2021-07-13)

[Compare
Source](https://togithub.com/crossnox/m2r2/compare/v0.3.0...v0.3.1)

-   Fix argparse for python3.10

###
[`v0.3.0`](https://togithub.com/crossnox/m2r2/blob/HEAD/CHANGES.md#Version-030-2021-07-12)

[Compare
Source](https://togithub.com/crossnox/m2r2/compare/v0.2.8...v0.3.0)

-   Add support for mermaid code
-   Change bump for bump2version

</details>

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docs/requirements.txt

@@ -1,4 +1,4 @@
 sphinx==3.5.4
 sphinx-rtd-theme==1.2.2
 sphinx-fakeinv==1.0.0
-m2r2==0.2.8
+m2r2==0.3.2