This generator gives you the option to generate a github-token using your github username and password.
Github deprecate this option and it should stop working on September 30, 2020, see:
https://developer.github.com/changes/2020-02-14-deprecating-password-auth/
https://github.com/octokit/auth-basic.js#%EF%B8%8F-deprecation-warning
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Possible Solution
The only option github proved us is to remove this functionality and use the token-based auth wich is also implemented by this the generator-node-mdl.