v0.5.0

What's Changed

• state conformance against nist ai 800-2 by @Adeniyikayodee in #51
• record run cost in environment.json by @Adeniyikayodee in #52
• add paired difference and plain grade output by @Adeniyikayodee in #53
• refuse writes to sealed bundles by @Adeniyikayodee in #54
• state the ceiling in inconclusive grade reasons by @Adeniyikayodee in #55
• release 0.5.0 by @Adeniyikayodee in #56

Full Changelog: v0.4.0...v0.5.0