Bump html-validator from 4.1.1 to 5.0.0

Bumps [html-validator](https://github.com/zrrrzzt/html-validator) from 4.1.1 to 5.0.0.
- [Release notes](https://github.com/zrrrzzt/html-validator/releases)
- [Commits](zrrrzzt/html-validator@4.1.1...5.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -62,7 +62,7 @@
     "eslint": "^6.5.1",
     "fs-extra": "^8.1.0",
     "fs-walk": "0.0.2",
-    "html-validator": "^4.1.1",
+    "html-validator": "^5.0.0",
     "htmlencode": "0.0.4",
     "mocha": "^6.2.1",
     "mockdate": "^2.0.5",