0.3.1

What's Changed

• Using latest openmc geometry plot by @shimwell in #53
• added depletion plotter by @shimwell in #54
• making use of dagmc geometry slice gui by @shimwell in #55
• added package versions by @shimwell in #56
• making use of code in subpackages by @shimwell in #58
• now importing openmc_geometry-plot gui by @shimwell in #57

Full Changelog: 0.3.0...0.3.1