`SiteChecker.prototype.on` is not a function

[hasezoey]

Describe the bug
SiteChecker.prototype.on is not a function

To Reproduce

const { SiteChecker } = require('broken-link-checker');
const { EventEmitter } = require('events');

const siteChecker = new SiteChecker({});

console.log(siteChecker instanceof EventEmitter); // logs: false

siteChecker.on('end', () => {}); // Error, ".on" is not a function

Expected behavior
to correctly inherit EventEmitter, or at least provide the mentioned functions

from the documentation:

All methods from EventEmitter are available.

Environment:

• OS and version: Manjaro 22.0.1
• Node.js version: 19.5.0
• broken-link-checker version: 0.7.8

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It seems like this issue would be solved if 0.8.0 would be released, as requested in #244