fix: upgrade shelljs from 0.8.4 to 0.8.5 (#96)

Snyk has created this PR to upgrade shelljs from 0.8.4 to 0.8.5.

See this package in npm:
https://www.npmjs.com/package/shelljs

See this project in Snyk:
https://app.snyk.io/org/tobiasbueschel/project/c274df48-450a-430d-81ac-5e7ae636b0a2?utm_source=github&utm_medium=referral&page=upgrade-pr