Make sure relevant package data is included in distributions

[CasperWA]

Fixes #141

Bumps version to v0.3.2

[codecov]

Codecov Report

Merging #142 into master will increase coverage by 0.26%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
+ Coverage   85.74%   86.01%   +0.26%     
==========================================
  Files          39       39              
  Lines        1824     1830       +6     
==========================================
+ Hits         1564     1574      +10     
+ Misses        260      256       -4

Flag	Coverage Δ
#unittests	86.01% <100%> (+0.26%)	⬆️

Impacted Files	Coverage Δ
optimade/server/mappers/entries.py	97.43% <ø> (ø)	⬆️
optimade/server/routers/utils.py	83.73% <100%> (+0.4%)	⬆️
optimade/server/config.py	93.26% <100%> (+0.26%)	⬆️
optimade/server/entry_collections.py	85.03% <100%> (+1.06%)	⬆️
optimade/server/routers/info.py	96.29% <100%> (+0.46%)	⬆️
optimade/server/exception_handlers.py	74.46% <0%> (+4.25%)	⬆️

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[ltalirz]

Thanks @CasperWA for fixing the inclusion of the right files.

I still have a few reservations about the test you added but in the interest of time it's fine to proceed.

[ltalirz]

I guess the real goal of this test is to "make sure that the PyPI distribution works".

I would argue that this is tested more strongly (and with less lines of code / maintenance needs) by adding a CI test that creates the package distribution, installs it (e.g. like this) and then runs either the whole test suite or some subset of it.

[CasperWA]

True. We could definitely have a GH Actions workflow that does this.