v0.7.0

This release only effects rendertree command and exported packages, not spannerplanviz command.

What's Changed

• feature: Compact format for plantree/rendertree by @apstndb in #37
• feat: Implement --known-flag by @apstndb in #38
• feature: Introduce rendertree wrapping by @apstndb in #39

Full Changelog: v0.6.0...v0.7.0