TST: Unpin tox

[pllim]

Description

This pull request is to fix #344

Also other changes to be consistent with spacetelescope/stsynphot_refactor#173

[codecov]

Codecov Report

Base: 97.08% // Head: 97.08% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (5d95783) compared to base (bdbadba).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #345      +/-   ##
==========================================
- Coverage   97.08%   97.08%   -0.01%     
==========================================
  Files          17       17              
  Lines        2024     2023       -1     
==========================================
- Hits         1965     1964       -1     
  Misses         59       59              

Impacted Files	Coverage Δ
synphot/binning.py	91.87% <100.00%> (ø)
synphot/blackbody.py	72.88% <100.00%> (ø)
synphot/models.py	95.75% <100.00%> (ø)
synphot/observation.py	99.06% <100.00%> (ø)
synphot/reddening.py	99.00% <100.00%> (ø)
synphot/specio.py	99.09% <100.00%> (-0.01%)	⬇️
synphot/spectrum.py	99.49% <100.00%> (ø)
synphot/thermal.py	100.00% <100.00%> (ø)
synphot/units.py	97.54% <100.00%> (ø)
synphot/utils.py	99.00% <100.00%> (ø)

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