Although the readme states the project served under MIT license this file is missing (required by the journal conventions: "Does the repository contain a plain-text LICENSE file with the contents of an OSI approved software license?")

openjournals/joss-reviews#1845

Hi @mado89, maybe I am missing something, but I added a MIT license I think ---> This project is licensed under the MIT License.

Yes that information is present. But afaik I understand it you need a copy of the license present in your repo and not only the reference.
Maybe @danielskatz can clarify.

Yes, a LICENSE file is needed