The Twitter authentication problem is also fixed now. You can keep on using the test endpoint https://onurmatik.github.io/twitter-trending-topics-archive/ as well.

I think you are referring to the test endpoint here: https://onurmatik.github.io/twitter-trending-topics-archive/
Due to the changes in Twitter authentication this endpoint is not available at the moment. Please use the API as described here: https://market.mashape.com/onurmatik/twitter-trending-topics-archive/