Various suggestions

[olivierdalang]

Hey ! Neat little app !! Thanks !!

Here are some suggestions, happy to create issues for those you think are interesting, I could maybe contribute some if you're accepting PRs.

• Currently, the diagram ignores inheritance. It simply shows all models with all inherited fields, as separate entities.
• Why not a Django management command ? Indeed a little bit more config to do (need to list it on INSTALLED_APPS), but it's more djangoic
• Oftentimes, attributes are not so interesting when compared to relation. A --no-attributes option would be nice for such cases when there are too many attributes (keep only the primary / unique fields, and display something like 38 more attributes)
• The readme says that mermaid is recognized by github markdown, yet it includes the example as an image, preventing from seing how github renders it. Would be nice to use that feature directly.

Thanks !!