0.8.3 Release

This is a patch release in the 0.8 series of Trellis. The notable changes include:

1. A refinement of how Memento Link headers are generated. Now, rather than including a header for every single Memento resource (which may grow quite large and cause difficulties for downstream applications and load balancers), the headers include only timegate, timemap, first, last, prev and next links, as is recommended by the Memento community. An application that needs the list of all Mementos can still retrieve that from the TimeMap resource.

2. Dependencies have been updated, as appropriate. The important update is the Jackson dependency for JSON handling, which addresses CVE-2019-12086.

There are no changes to the Java interfaces, and there is no need for any data migration.