Changes Since Last Release

Fix solr casting when an updated_at key isn't present in the solr document.
tpendragon
Add missing query service requirement to persister shared specs
cjcolvar
Provide a warning when postgres adapter overwrites an ID, deprecate this
behavior so it will throw an exception in the future.
cam156
hackmastera
tpendragon
Add support for passing just an ID to find_inverse_references_by
cam156
hackmastera
Fix memory adapter raising an exception in find_by_alternate_identifier when
there are resources without the alternate_identifier attribute.
jeremyf
Provide a warning when using the postgres adapter without manually providing
the pg gem, so it can be an optional dependency in 2.0.0.
hackmastera
Provide guidance in specs on how to define alternate_ids
cjcolvar
Upload files to Fedora using form/multipart.
tpendragon
Improve CompositePersister documentation.
tpendragon
Add a Valkyrie::Types::Params::ID type which handles when an HTML form passes
an empty string value.
tpendragon
Deprecate .member on Valkyrie::Types::Array & Set
tpendragon
Fix updated_at not being set correctly for the Solr adapter, fix shared specs.
tpendragon

Additional thanks to the following for code review and issue reports leading to
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