Fix broken links in readme

[comodoro]

I have replaced broken links if the source could be found, but could not find Acoustic Events Dataset, I suppose it is the paper https://arxiv.org/pdf/1701.00599.pdf and page http://www.vision.ee.ethz.ch/en/datasets/, but it is not there. Furthermore I have not looked at the code yet, maybe there also are some outdated urls?

[ynop]

Thanks!

It was introduced in this paper: https://arxiv.org/pdf/1604.07160.pdf

But you are right, I didn't find the corpus to download either.
I guess we should just replace the url with that of the paper.
If you change that I will merge the pr.

I am not sure about code, but at least the downloader for AED won't work anymore.
I opened a separate issue (#88) for that purpose.

[comodoro]

Done. However if it doesn't work, you can consider making it strikeout or removing it