Fix operator<< compiler error when c++20 enabled #53
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Identified compilation error while attempting to use latest version of library within project that uses C++20
Recreated error while compiling tests with UUID_USING_CXX20_SPAN switched on.
Problem appears to be due to prior change to operator<< to use to_string, which is currently defined after operator<< and it would seem C++20 is stricter in this regard (or at least MSVC is). Fixed by moving operator<< below to_string implementation.