fixed megalinter request

Author: GiorgioAlbertoLucia

PWGLF/Tasks/Nuspex/nucleiFromHypertritonMap.cxx

@@ -42,6 +42,7 @@
 #include <TVector3.h>
 
 #include <vector>
+#include <string>
 
 using namespace std;
 using namespace o2;