Update README.md

BestPracticeRules/README.md

@@ -18,7 +18,6 @@ Following these steps will automatically load the Best Practice Rules into your
 
         System.Net.WebClient w = new System.Net.WebClient(); 
         
-        string userName = System.Environment.UserName; 
         string path = System.Environment.GetFolderPath(System.Environment.SpecialFolder.LocalApplicationData);
         string url = "https://raw.githubusercontent.com/microsoft/Analysis-Services/master/BestPracticeRules/BPARules.json";
         string downloadLoc = path+@"\TabularEditor\BPARules.json";