Custom ruleset, fix: file created is HTML, should be .md

[discombobulateme]

At repolinter.json we define our custom ruleset.
In each rule, if test fails, it is asked to create a new file.
New file is created in the temporary directory.

The new file created should be .md, instead it's creating a huge HTML, I guess cloning all the reference page instead of the file

Todo:

• [] Clone reference file as .md

[discombobulateme]

Check: https://github.com/todogroup/repolinter/blob/master/fixes/file-create.js