Describe the bug
Our application suddenly broke today because validator automatically updated to v13.15.22 (published ~7 hours ago).
The new build on npm seems to contain optional chaining (?.) inside the distributed code (e.g., in isMACAddress.js), which was never present in previous versions (e.g., v13.15.20).

This change causes syntax errors on environments running older Node.js versions that don’t support optional chaining.

Examples

Reproductions
N/A

Additional context
Validator.js version: 13.15.22
Node.js version: 10