Uncap `mdformat < 0.8.0` requirement

[kdeldycke]

Describe the bug

mdformat 1.0.0 has just been released.

Unfortunately I cannot install mdformat_simple_breaks because it is capping mdformat to < 0.8.0:

$ uv pip install "mdformat == 1.0.0" "mdformat_simple_breaks == 0.0.1"
  × No solution found when resolving dependencies:
  ╰─▶ Because mdformat-simple-breaks==0.0.1 depends on mdformat>=0.7.0,<0.8.0 and you require mdformat==1.0.0, we can conclude that your requirements and mdformat-simple-breaks==0.0.1 are incompatible.
      And because you require mdformat-simple-breaks==0.0.1, we can conclude that your requirements are unsatisfiable.

[kdeldycke]

I just proposed a fix as a PR at: #4

[kdeldycke]

For the record I tested the current master branch against my menagerie of mdformat plugins, and I can confirm it fixes incompatibilities with mdformat 1.0.0.

So to me the master branch of mdformat-simple-breaks can be released on PyPi.

CC @KyleKing.

[csala]

@kdeldycke @KyleKing and everyone, v0.1.0 has been released and tested successfully alongside mdformat==1.0.0