Update skimmerOTS.cxx

Author: dsekihat

PWGEM/Dilepton/TableProducer/skimmerOTS.cxx

@@ -14,6 +14,9 @@
 // This code produces trigger information. OTS = offline trigger selection.
 //    Please write to: daiki.sekihata@cern.ch
 
+#include <string>
+#include <vector>
+
 #include "Framework/runDataProcessing.h"
 #include "Framework/AnalysisTask.h"
 #include "Framework/AnalysisDataModel.h"