Issue in using example from Grammarinator

[Hasask]

I'm currently trying to follow the example prompts given in the repository to install and run Grammarinator on the HTML example shown, but I keep coming across several errors in the bash terminal. Specifically, whenever I pip install grammarinator, it prompts me to install several packages that were installed, but all were older versions of grammarinator. Additionally, when I try running the example shown in this repository, I am met with this error:

ImportError: cannot import name 'UnparserRuleContext' from 'grammarinator.runtime'

When I try processing and running it with my own ANTLR4 grammar file, it also produces similar errors.

[renatahodovan]

@Hasask Thanks for the report! The ImportError you encountered is most likely due to using the latest examples from the documentation with an older version of Grammarinator. The version currently available on PyPI is quite outdated — we're in the process of preparing a new release. In the meantime, please try installing the latest version directly from the master branch on GitHub and see if that resolves the issue.