chore: bump htmlparser2 from 6.1.0 to 7.0.0 (hexojs#257)

Bumps [htmlparser2](https://github.com/fb55/htmlparser2) from 6.1.0 to 7.0.0.
- [Release notes](https://github.com/fb55/htmlparser2/releases)
- [Commits](fb55/htmlparser2@v6.1.0...v7.0.0)

---
updated-dependencies:
- dependency-name: htmlparser2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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package.json

@@ -48,7 +48,7 @@
     "cross-spawn": "^7.0.0",
     "deepmerge": "^4.2.2",
     "highlight.js": "^11.0.1",
-    "htmlparser2": "^6.0.0",
+    "htmlparser2": "^7.0.0",
     "prismjs": "^1.17.1",
     "strip-indent": "^3.0.0"
   },