Update dependency tree-kill to v1.2.2

[mend-for-github-com[bot]]

This PR contains the following updates:

Package	Type	Update	Change
tree-kill	dependencies	patch	1.2.1 -> 1.2.2

By merging this PR, the issue #48 will be automatically resolved and closed:

Severity	CVSS Score	CVE
Critical	9.8	CVE-2019-15599

---

Release Notes

pkrumins/node-tree-kill (tree-kill)

### [`v1.2.2`](https://redirect.github.com/pkrumins/node-tree-kill/compare/v1.2.1...v1.2.2) [Compare Source](https://redirect.github.com/pkrumins/node-tree-kill/compare/v1.2.1...v1.2.2)

---

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