Release of OpenMC 0.12.0

Hi all,

I’m happy to announce that version 0.12.0 of OpenMC has just been released! I’d encourage you to take a look at the release notes here to learn about the improvements and fixes that have been made since our last release. A huge thanks to all the developers who contributed to the release as well as the many users who provided excellent feedback and suggestions on fixes and improvements.

Best regards,

Dear Paul,

Awesome :+1::+1::+1::+1: