The latest MSVC compiler throws the following warning on
nlohmann::detail::exception::what() if /analyze is enabled:

```
vcruntime_exception.h(93) : warning C28204: 'what' has an override at
`nlohmann\json\develop\single_include\nlohmann\json.hpp(2644)`
and only the override is annotated for return: when an override is
annotated, the base (this function) should be similarly annotated.
```

See https://godbolt.org/z/r331h4

Better diagnostics

 Conflicts:
	include/nlohmann/detail/input/parser.hpp
	single_include/nlohmann/json.hpp

Fix missing 1.78 in example in README.md

Co-authored-by: Alexander Karzhenkov <karzhenkov@mail.ru>

Add GDB pretty printer

readme: fix tilde character display