[fix] add fallback_version to scm settings

[areski]

Description

setuptools_scm [https://pypi.org/project/setuptools-scm/] is causing issues if you are trying to install this package directly from a zip or tar.gz.
That is expected as there is no metadata in the archive file, and the following error will raise:

      LookupError: setuptools-scm was unable to detect version for /tmp/pip-req-build-plm5aze3.

This is probably not affecting a lot of people but there is situation where it's not possible to use git to install the package, or wait for the latest version to be on pypi.

Alternative solutions

• Use env SETUPTOOLS_SCM_FALLBACK_VERSION
• Use git archives: https://pypi.org/project/setuptools-scm-git-archive/

Related Issue

ref: #960 (comment)
ref: pypa/setuptools-scm#409

Proposed Solution

A quick workaround is using fallback_version see attached PR,
there is certainly more elegant solution, hopefully one that could still use the latest tag.

[codecov]

Codecov Report

Merging #981 (c9fa8cf) into master (720fd8a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #981   +/-   ##
=======================================
  Coverage   97.64%   97.64%           
=======================================
  Files          23       23           
  Lines        1147     1147           
  Branches      222      222           
=======================================
  Hits         1120     1120           
  Misses         12       12           
  Partials       15       15           

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[jeking3]

As a workaround you can use the following requirements.txt syntax to pull a hash directly from GitHub:

django-simple-history @ git+https://github.com/jazzband/django-simple-history@<GIT HASH, BRANCH, OR TAG>#egg=django-simple-history-3.1.1+

[areski]

Thanks for the merge and the hint, unfortunately I cannot use Git in my , only tar.gz or zip.
Thanks anyway :)