v0.7.0

Serde improvements:

• serde(untagged) for all enum types
  • (de)serializes to/from same as contained variant type
  • switching from concrete interpolator to interpolatorenum in downstream projects won't break serialized objects
• strategies now serialize to stringified name strings, rather than null, to be more descriptive

Full Changelog: v0.6.4...v0.7.0