v0.17.0 release notes

[ml-evs]

This minor release contains fixes recommended for those deploying the optimade-python-tools reference server:

• The meta->data_returned field was previously incorrect when using the MongoDB backend.
• Incoming URL query parameters are now validated against the provided query parameters class (if using custom query parameters, this class should be extended or the parameters should use your registered provider prefix). This functionality can be disabled with the validate_query_parameters config option.
• The results of some queries were not reversible with MongoDB (e.g., nelements != 2 vs 2 != nelements); this has now been fixed.

[ml-evs]

This issue was made to include release notes in the generated changelog following these instructions: https://github.com/github-changelog-generator/github-changelog-generator#using-the-summary-section-feature

Just thought it was worth doing to summarise changes to server providers.