Release patch 1.0.1 with torch install_requires fix

Thanks for creating this useful library. We recently included it as part of our low code toolkit, Ludwig. However, we ran into an issue whereby if the user does not have torch already installed before installing entmax, it raises an exception:

× python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [10 lines of output]
      Traceback (most recent call last):
        File "<string>", line 36, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "/tmp/pip-install-xasbhx2w/entmax_64da4068d2414a04a5c3adc7187695b4/setup.py", line 2, in <module>
          from entmax import __version__
        File "/tmp/pip-install-xasbhx2w/entmax_64da4068d2414a04a5c3adc7187695b4/entmax/__init__.py", line 3, in <module>
          from entmax.activations import sparsemax, entmax15, Sparsemax, Entmax15
        File "/tmp/pip-install-xasbhx2w/entmax_64da4068d2414a04a5c3adc7187695b4/entmax/activations.py", line 13, in <module>
          import torch
      ModuleNotFoundError: No module named 'torch'
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

Looks like this was fixed some time back here, but this change was made after the v1.0 release, meaning the current production release has this bug. Can you create a patch release v1.0.1 that includes this fix?

Thanks.

[bpopeters]

Fixed via #25.

[lukas-blecher]

@bpopeters (or @vene) please merge one of the above and release a new version.