fix(deps): update rust crate htmd to v0.1.6 (#144)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [htmd](https://togithub.com/letmutex/htmd) | dependencies | patch |
`0.1.5` -> `0.1.6` |

---

### Release Notes

<details>
<summary>letmutex/htmd (htmd)</summary>

### [`v0.1.6`](https://togithub.com/letmutex/htmd/releases/tag/v0.1.6)

[Compare
Source](https://togithub.com/letmutex/htmd/compare/v0.1.5...v0.1.6)

#### What's Changed

- Make Send and Sync supertraits of ElementHandler by
[@&#8203;letmutex](https://togithub.com/letmutex) in
[https://github.com/letmutex/htmd/pull/17](https://togithub.com/letmutex/htmd/pull/17)
- Clippy + Fmt by [@&#8203;lukaslueg](https://togithub.com/lukaslueg) in
[https://github.com/letmutex/htmd/pull/18](https://togithub.com/letmutex/htmd/pull/18)
- Fix missing title in referenced links by
[@&#8203;letmutex](https://togithub.com/letmutex) in
[https://github.com/letmutex/htmd/pull/19](https://togithub.com/letmutex/htmd/pull/19)

#### New Contributors

- [@&#8203;lukaslueg](https://togithub.com/lukaslueg) made their first
contribution in
[https://github.com/letmutex/htmd/pull/18](https://togithub.com/letmutex/htmd/pull/18)

**Full Changelog**:
letmutex/htmd@v0.1.5...v0.1.6

</details>

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