Class invalid_json_exception

include/jwt-cpp/jwt.h:2723–2725

* Attempt to parse JSON was unsuccessful */

		 * Attempt to parse JSON was unsuccessful
		 */
		struct invalid_json_exception : public std::runtime_error {
			invalid_json_exception() : runtime_error("invalid json") {}
		};
		/**
		 * Attempt to access claim was unsuccessful
		 */