How to download a zipfile from a Github repository

I’m trying to download a zipfile from a Github repository with this command:

wget --no-check-certificate https://github.com/brendenlake/omniglot/blob/master/python/images_evaluation.zip -O /tmp/images_evaluation.zip

But it doesn’t download a valid zip file. I suppose that it downloads the HTML file that the browser shows if you click on the url.

How can I download a zip file from a public Github repository using wget?