Replaced a link to Line Profiler Third-party panel.

[mikekeda]

https://github.com/dmclain/django-debug-toolbar-line-profiler is abandoned (last commit was 5years ago)
It doesn't work with django 3 and django-debug-toolbar 2
Changes - https://github.com/dmclain/django-debug-toolbar-line-profiler/pull/21/files

This fork works with Django 3.1 and django-debug-toolbar 2.2

[matthiask]

Thank you! It's a bit confusing that the repository and the import path doesn't match the package name on PyPI.

Maybe you should rename the repository and imports while you're at it?

(That's not a request for change, just a question/suggestion.)

[mikekeda]

I discussed this with @Mogost and decided to change only the name on pypi and not change the internal structure, this will give a smooth transition from the old version to the new one.

[Mogost]

Nice work @mikekeda. I was just about to update the links, but you are faster.