[EMCAL-502] Increment ClassDef version of the Digit

Due to the change from Energy to Amplitude the new
digit class is no longer compatible with the old
layout. Therefore the ClassDef needs to be increased.

Author: mfasDa

DataFormats/Detectors/EMCAL/include/DataFormatsEMCAL/Digit.h

@@ -89,7 +89,7 @@ class Digit : public DigitBase
   Short_t mTower = -1;                                   ///< Tower index (absolute cell ID)
   ChannelType_t mChannelType = ChannelType_t::HIGH_GAIN; ///< Channel type (high gain, low gain, TRU, LEDMON)
 
-  ClassDefNV(Digit, 1);
+  ClassDefNV(Digit, 2);
 };
 
 std::ostream& operator<<(std::ostream& stream, const Digit& dig);