Remove one author from TMVA list

git-svn-id: http://root.cern.ch/svn/root/trunk@31864 27541ba8-7e3a-0410-8455-c3a389f83636

README/CREDITS

@@ -631,10 +631,6 @@ N: Miha Puc
 E: miha.puc@marvin.fmf.uni-lj.si
 D: contributed to TMath::Voigt
 
-N: Xavier Prudent
-E: prudent@lapp.in2p3.fr
-D: contributed to TMVA classes
-
 N: Gilles Quemener
 E: quemener@lpsc.in2p3.fr
 D: contributed to TMultiDimFit::EvalError function