Updating README

Author: dmajumder

README.md

@@ -14,7 +14,7 @@ git remote add btv-cmssw https://github.com/cms-btv-pog/cmssw.git
 git fetch --tags btv-cmssw
 
 git clone -b V00-00-01 git://github.com/cms-btv-pog/cms-EventCounter.git MyAnalysis/EventCounter
-git clone -b 7_4_X_25ns_v2.02 https://github.com/cms-btv-pog/RecoBTag-PerformanceMeasurements.git RecoBTag/PerformanceMeasurements
+git clone -b 7_4_X_25ns_v3.00 https://github.com/cms-btv-pog/RecoBTag-PerformanceMeasurements.git RecoBTag/PerformanceMeasurements
 
 scram b -j8