fix: upgrade hexo from 4.0.0 to 4.2.0 (#14)

Snyk has created this PR to upgrade hexo from 4.0.0 to 4.2.0.

See this package in NPM:
https://www.npmjs.com/package/hexo

See this project in Snyk:
https://app.snyk.io/org/michaelkohler-eeo/project/a7d76bb4-a4ae-41bc-b632-f9d9846d11ac?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot