What does this change do?
Is it related to an exisiting bug report or feature request?
Pre-merge checklist
- I've read CONTRIBUTING.md
- I've rebased my changes against the current HEAD of
origin/master(if necessary) - I've added new test cases to verify my change
- I've regenerated toml.hpp (how-to)
- I've updated any affected documentation
- I've rebuilt and run the tests with at least one of:
- Clang 8 or higher
- GCC 8 or higher
- MSVC 19.20 (Visual Studio 2019) or higher
- I've added my name to the list of contributors in README.md