Include TKey.h (#6416)

pzhristov · hristov · web-flow · commit 1286a1417138 · 2021-06-14T13:14:44.000+02:00
Co-authored-by: hristov &lt;Peter.Hristov@cern.ch&gt;
Trivial change, merging.
diff --git a/Detectors/TPC/calibration/src/IDCAverageGroup.cxx b/Detectors/TPC/calibration/src/IDCAverageGroup.cxx
@@ -19,6 +19,7 @@
 #include "TH2Poly.h"
 #include "TCanvas.h"
 #include "TLatex.h"
+#include "TKey.h"
 #include "Framework/Logger.h"
 
 #if (defined(WITH_OPENMP) || defined(_OPENMP)) && !defined(__CLING__)
