Update checkout path

Author: emilbols

README.md

@@ -15,7 +15,7 @@ setenv CMSSW_GIT_REFERENCE /cvmfs/cms.cern.ch/cmssw.git.daily
 
 git cms-init
 
-git clone -b 10_6_X_v2.01 --depth 1 https://github.com/cms-btv-pog/RecoBTag-PerformanceMeasurements.git RecoBTag/PerformanceMeasurements
+git clone -b 10_6_X_UL2016_PreliminaryJECs --depth 1 https://github.com/cms-btv-pog/RecoBTag-PerformanceMeasurements.git RecoBTag/PerformanceMeasurements
 
 scram b -j8