3.0-rc2

What's Changed

• Performance improvements by @kunitoki in #40
• Fix luajit invalid lightuserdata on older tags by @kunitoki in #45
• Respect noexcept specifications by @kunitoki in #47
• Improve coroutines support by @kunitoki in #49
• Fix shared_ptr usage with inheritance by @kunitoki in #52
• Fix mutable references always bypassing library / user containers by @kunitoki in #57
• Improved enums bindings by @kunitoki in #56
• Update Manual.md by @kunitoki in #58
• Fix enum includes and doxygen by @kunitoki in #59
• Fix overload resolution by @kunitoki in #64
• Fix issue with overaligned UserdataValue by @kunitoki in #72
• Custom assert by @kunitoki in #73
• Fix optional type to allow be constructed on LUA_TNONE by @kunitoki in #76

Full Changelog: 3.0-rc1...3.0-rc2