build: Set only lower bounds on core dependencies

[matthewfeickert]

c.f. scikit-hep/pyhf#1382 for description of general motivation.

Also updates lower bound on particle as originally recommended in PR #108.

* Place only lower bounds (>=) on all core dependencies in setup.cfg.
* Update lower bond on particle to v0.16 to ensure compliance with the
2021 version of the PDG.

Co-authored-by: Eduardo Rodrigues <[email protected]>

[codecov]

Codecov Report

Merging #113 (ec5aaaa) into master (a7a4f0f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #113   +/-   ##
=======================================
  Coverage   60.39%   60.39%           
=======================================
  Files           2        2           
  Lines         202      202           
  Branches       55       55           
=======================================
  Hits          122      122           
  Misses         72       72           
  Partials        8        8           

Flag	Coverage Δ
unittests	60.39% <ø> (ø)

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