**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 6 or higher
- [ ] GCC 7 or higher
- [ ] MSVC 19.20 (Visual Studio 2019) or higher
- [ ] I've added my name to the list of contributors in [README.md](https://github.com/marzer/tomlplusplus/blob/master/README.md)
[CONTRIBUTING.md]: https://github.com/marzer/tomlplusplus/blob/master/CONTRIBUTING.md
[how-to]: https://github.com/marzer/tomlplusplus/blob/master/CONTRIBUTING.md#regenerating-tomlhpp
[README.md]: https://github.com/marzer/tomlplusplus/blob/master/README.md