Correct a warning from cppcheck:

binary_reader.hpp:650: (style) Unsigned expression 'mant' can't be negative so it is unnecessary to test it

https://github.com/Xav83/nlohmann-json-cppcheck/commit/910a7d2b873dd7ae92ec81cced2bf73200ff4848/checks#step:5:84Signed-off-by: Xav83 <x.jouvenot@gmail.com>

include/nlohmann/detail/input/binary_reader.hpp

@@ -647,7 +647,7 @@ class binary_reader
                     const int exp = (half >> 10u) & 0x1Fu;
                     const unsigned int mant = half & 0x3FFu;
                     assert(0 <= exp and exp <= 32);
-                    assert(0 <= mant and mant <= 1024);
+                    assert(mant <= 1024);
                     switch (exp)
                     {
                         case 0: