Working correctly

src/billy_objects.cpp

@@ -1,6 +1,7 @@
 #include "billy_objects.hpp"
 #include "characteristic.hpp"
 #include "character_sheet.hpp"
+#include <nlohmann/json.hpp>
 
 std::uint32_t constexpr const_hash(const char *input) {
     return *input ? static_cast<unsigned int>(*input) + 33 * const_hash(input + 1) : 5381;