Bumps [commonmark](https://github.com/rtfd/CommonMark-py) from 0.7.5 to 0.8.1.
<details>
<summary>Release notes</summary>
*Sourced from [commonmark's releases](https://github.com/rtfd/CommonMark-py/releases).*
> ## 0.8.1
> Removed `CommonMark` symlink. So, as of this version, you need to replace all instances of `CommonMark` with `commonmark` in your code.
>
> ## 0.8.0
> - Added the `Node.normalize()` method. (from [**lez**](https://github.com/lez))
> - Renamed package name to `commonmark` for PEP8 compliance. You can now do `import commonmark` as well as `import CommonMark`. Closes [#60](https://github-redirect.dependabot.com/rtfd/CommonMark-py/issues/60)
> - Added testing on Python 3.7.
</details>
<details>
<summary>Changelog</summary>
*Sourced from [commonmark's changelog](https://github.com/rtfd/CommonMark-py/blob/master/CHANGELOG.md).*
> ## 0.8.1 (2018-09-06)
> - Removed `CommonMark` symlink. So, as of this version, you need to replace all instances of `CommonMark` with `commonmark` in your code.
>
> ## 0.8.0 (2018-09-03)
> - Added the `Node.normalize()` method. (from [**lez**](https://github.com/lez))
> - Renamed package name to `commonmark` for PEP8 compliance. You can now do `import commonmark` as well as `import CommonMark`. Closes [#60](https://github-redirect.dependabot.com/rtfd/CommonMark-py/issues/60)
> - Added testing on Python 3.7.
</details>
<details>
<summary>Commits</summary>
- [`9243e14`](9243e14c8a) 🔖 release version 0.8.1
- [`9339d8a`](9339d8a44d) Merge pull request [#135](https://github-redirect.dependabot.com/rtfd/CommonMark-py/issues/135) from rtfd/cleanup
- [`4ee43fb`](4ee43fbfbc) remove CommonMark symlink ([#134](https://github-redirect.dependabot.com/rtfd/CommonMark-py/issues/134))
- [`77f7e6b`](77f7e6bc80) Merge pull request [#133](https://github-redirect.dependabot.com/rtfd/CommonMark-py/issues/133) from rtfd/long-desc
- [`acdceed`](acdceed0c8) Add long description for pypi readme display
- [`604d6ba`](604d6baada) fix typo
- [`8744823`](8744823877) add python 3.7 to tox file
- [`8b99773`](8b99773deb) Merge pull request [#132](https://github-redirect.dependabot.com/rtfd/CommonMark-py/issues/132) from rtfd/release-0.8.0
- [`5108773`](5108773282) 🔖 release version 0.8.0
- [`e3777a9`](e3777a9e9d) Update CHANGELOG.md
- Additional commits viewable in [compare view](https://github.com/rtfd/CommonMark-py/compare/0.7.5...0.8.1)
</details>
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