Broken link at gistStyleGuide.md

[larisa1995]

Maybe you could replace [1] by [2] at "The notion of rigid classes originates in OntoClean" [3] because [1] throws "{"message":"Token is required"}".

[1] https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.99.7618&rep=rep1&type=pdf
[2] https://scholar.archive.org/work/na4kfdl4hfczjgbwwnportg46y
[3] https://github.com/semanticarts/gist/blob/develop/docs/gistStyleGuide.md

[rjyounes]

Thanks for pointing this out, @larisa1995. We will get it corrected in the next release.