Up to v0.10.0

[CasperWA]

Major updates:

• Use the OPTIMADE Validator action to check the implementation, both in CI and in the pytesting (Update CI workflow #114)
• Add middleware from optimade to (Update CI workflow #114):
  • Ensure a wrongly versioned base URL returns HTTP code 553.
  • Add support for the api_hint query parameter.
  • Catch Python Warnings and report them in the response as OPTIMADE Warning objects.
    Note, for this to work, one has to subclass optimade.server.warnings.OptimadeWarning.

Minor updates:

• Support optimade v0.12.0 (Update CI workflow #114)

Bug fixes:

• Fix OPTIMADE badge in README (Fix OPTIMADE version updater invoke task #112)

[codecov]

Codecov Report

Merging #118 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #118   +/-   ##
========================================
  Coverage    90.48%   90.48%           
========================================
  Files           27       27           
  Lines          998      998           
========================================
  Hits           903      903           
  Misses          95       95           

Flag	Coverage Δ
#pytest	90.48% <ø> (ø)

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