minor code cleaning

examples/exFit.cpp

@@ -41,7 +41,6 @@ int main(void)
     FitResult p;
     MinuitMinimizer minimizer;
     
-    minimizer.setVerbosity(MinuitMinimizer::Verbosity::Debug);
     p = data.fit(minimizer, init, f);
     cout << "a= " << p(0) << " b= " << p(1);
     cout << " chi^2/ndof= " << p.getChi2PerDof();