Update dependency natural to v6.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
natural	6.5.0 -> 6.8.0

---

Release Notes

NaturalNode/natural (natural)

### [`v6.8.0`](https://togithub.com/NaturalNode/natural/releases/tag/6.8.0): Support for extending lexicons [Compare Source](https://togithub.com/NaturalNode/natural/compare/6.7.2...6.8.0) ### [`v6.7.2`](https://togithub.com/NaturalNode/natural/releases/tag/6.7.2): Repair a bug in Jaro-Winkler distance [Compare Source](https://togithub.com/NaturalNode/natural/compare/6.7.1...6.7.2) ### [`v6.7.1`](https://togithub.com/NaturalNode/natural/releases/tag/6.7.1): FIx http link to Github pages [Compare Source](https://togithub.com/NaturalNode/natural/compare/6.7.0...6.7.1) ### [`v6.7.0`](https://togithub.com/NaturalNode/natural/releases/tag/6.7.0): Add Hindi Tokenizer [Compare Source](https://togithub.com/NaturalNode/natural/compare/6.6.0...6.7.0) ### [`v6.6.0`](https://togithub.com/NaturalNode/natural/releases/tag/6.6.0): Added German sentimenter [Compare Source](https://togithub.com/NaturalNode/natural/compare/6.5.1...6.6.0) ### [`v6.5.1`](https://togithub.com/NaturalNode/natural/releases/tag/6.5.1): Added a word to stopwords [Compare Source](https://togithub.com/NaturalNode/natural/compare/6.5.0...6.5.1)

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.