Version 2.0.0-rc.2

#391 - Change exception type/message when project item does not exist (@maxbanas) - to help people troubleshoot issues like #378
#392 - Change targeting for .Net standard 2.0 (@Vincentvwal) - Fixes #390

Generated from: https://github.com/toddams/RazorLight/milestone/11?closed=1