v0.55.0

Primary changes:

• #391, fix ClassCastException with :in clauses using AtlasRegistry.
• #392, work around for multiple ServoRegistry instances.
• #393, improve the performance of Spectator.globalRegistry().
• #395, add agent config for Artifactory (thanks @ebukoski).
• #397, update to nebula 3.6.0.
• #398, merge subscriptions from lwc response.
• #399, agent now supports loading configs from the file system.

A comprehensive list of changes can be found in the commit log: v0.54.0...v0.55.0