change append() to appendChild()

[rbastiansch]

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Thanks for Submitting a pull request. Before you hit that button please make sure:

These files are meant to be 1:1 copies of what is done in the video. If you found a better / different way to do things or fixed a small bug, that is great great, but I will be keeping them the same as the videos to avoid confusing.

Spelling mistakes / CSS updates / other clarifications are welcome as long as they don't change what is shown in the videos.

I encourage you to blog about your implementation and add the link to this repo - that way everyone can benefit from it.

[rbastiansch]

I've changed because console was giving me "document.body.append() is not a function" and is working now using apeendChild().

[wesbos]

If you are using an unsupported browser, you'll have to polyfill it:

https://developer.mozilla.org/en-US/docs/Web/API/ParentNode/append

BUT since appendChild() does the same thing here - I see no reason not to merge it :) Thanks