There was no obvious reason to use BSD instead of MIT for that very basic chat app.

Closes #3411

Diff: socketio/engine.io@3.3.1...3.4.0

Fix documentation about default origins value. The default should read `*:*` instead of `*

Diff: socketio/socket.io-parser@3.3.0...3.4.0

Diff: 2.2.0...2.3.0

Due to the recent changes to the Travis CI platform (see [1]), we will
now use GitHub Actions to run the tests.

Reference: https://docs.github.com/en/free-pro-team@latest/actions/guides/building-and-testing-nodejs

[1]: https://blog.travis-ci.com/2020-11-02-travis-ci-new-billing

Diff: socketio/engine.io@3.4.2...3.5.0

The `query` option of the Manager had the priority over the one of the
Socket instance, which meant updating the Socket#query object on the
client-side was not reflected in the Socket#handshake object on the
server-side.

Please note that the behavior of the `query` option is still a bit
weird in Socket.IO v2, as it only applies to non-default namespace.
This is fixed in v3:

- https://socket.io/docs/v3/migrating-from-2-x-to-3-0/#Add-a-clear-distinction-between-the-Manager-query-option-and-the-Socket-query-option
- https://socket.io/docs/v3/middlewares/#Sending-credentials

Fixes #3495

BREAKING CHANGE: previously, all origins were allowed by default, which
meant that a Socket.IO server sent the necessary CORS headers
(`Access-Control-Allow-xxx`) to any domain by default.

Please note that you are not impacted if:

- you are using Socket.IO v2 and the `origins` option to restrict the list of allowed domains
- you are using Socket.IO v3 (disabled by default)

This commit also removes the support for '*' matchers and protocol-less
URL:

```
io.origins('https://example.com:443'); => io.origins(['https://example.com']);
io.origins('localhost:3000');          => io.origins(['http://localhost:3000']);
io.origins('http://localhost:*');      => io.origins(['http://localhost:3000']);
io.origins('*:3000');                  => io.origins(['http://localhost:3000']);
```

To restore the previous behavior (please use with caution):

```js
io.origins((_, callback) => {
  callback(null, true);
});
```

See also:

- https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
- https://socket.io/docs/v3/handling-cors/
- https://socket.io/docs/v3/migrating-from-2-x-to-3-0/#CORS-handling

Thanks a lot to https://github.com/ni8walk3r for the security report.

Diff: 2.3.0...2.4.0

This reverts commit f78a575.

This commit contains a breaking change which deviates from semver,
which we try to follow as closely as possible. That's why this change
is reverted and we will rather suggest users to upgrade to v3.

Related: #3741

Diff: 2.4.0...2.4.1