Fix setuptools_scm generating version 0.0.0

[hugovk]

#31 resulted in https://test.pypi.org/project/tinytext/0.0.0/

to use setup.py as you write, you either need the latest setuptools and the latest setuptools_scm pre-installed or as setup_requires in setup.py/cfg,

setup.py invocations will NOT install build requirements from pyproject.toml

if you have a modern pip installed, i believe a pip wheel . should produce the desired results

pypa/setuptools-scm#386 (comment)

[codecov]

Codecov Report

Merging #33 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #33   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           13        13           
=========================================
  Hits            13        13           

Flag	Coverage Δ
#GHA_Ubuntu1604	100.00% <ø> (ø)
#GHA_Ubuntu1804	100.00% <ø> (ø)
#GHA_macOS	100.00% <ø> (ø)
#TravisCI	100.00% <ø> (ø)

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