Merge pull request #2673 from remyjette/remove-exception-annotation

Remove HEDLEY annotation from exception::what()

include/nlohmann/detail/exceptions.hpp

@@ -49,7 +49,6 @@ class exception : public std::exception
 {
   public:
     /// returns the explanatory string
-    JSON_HEDLEY_RETURNS_NON_NULL
     const char* what() const noexcept override
     {
         return m.what();

single_include/nlohmann/json.hpp

@@ -2640,7 +2640,6 @@ class exception : public std::exception
 {
   public:
     /// returns the explanatory string
-    JSON_HEDLEY_RETURNS_NON_NULL
     const char* what() const noexcept override
     {
         return m.what();