Lint against hyphens at the end of lines

[JelleZijlstra]

PEP 520 has this text in its rst:

Additionally, this PEP requires that the default class definition
namespace be ordered (e.g. ``OrderedDict``) by default.  The long-
lived class namespace (``__dict__``) will remain a ``dict``.

This gets rendered as:

But there should be no space after the hyphen in the output.

A regex like '[a-z]-$' would catch this with few if any false positives. Could sphinx-lint add a rule looking for this issue?

[hugovk]

Please see PR #56.