Change NotifyOnChangeOnly to accept a list

[Beastlybear2017]

I apologise if this is really dumb, I have never attempted to contribute towards a npm package before and have no clue how to / if it is possible to test it from a local file.

Here is my vision of how this would work, although have no clue if it works in practice :)

[ghaiklor]

@Beastlybear2017 you can try to write a test, where to check if your solutions works.

Here, for instance, test case that checks if the notifyChange works:

https://github.com/ghaiklor/icecast-parser/blob/e6ba7a3cb7161eb0c9ce08039533fa5f8afa1dda/test/Parser.spec.ts#L57-L65

You can add more cases like that where you check scenarios like “what if you provided no keys at all, that way it should notify every time” or “what if I provided the keys that doesn't exist in metadata, it should notify” and so on.

[Beastlybear2017]

I have added the tests (updated yours to use the new system), fixed any issues and commited my changes. All the tests pass / fail when they should https://github.com/Beastlybear2017/icecast-parser/blob/ccab52975b0fdf5586ff5734e9a171cdcffe779a/test/Parser.spec.ts#L68-L95

[Beastlybear2017]

Was able to test within my project and fixed an issue that I discorvered. Now works as intened

[ghaiklor]

Great work!

However, let's keep it backward compatible with older API. Let's leave the possibility to specify the boolean as before.