Update README.md (#2149)

Author: chcosta

README.md

@@ -187,4 +187,4 @@ The code is broken into several main sections:
   heap using Microsoft.Diagnostics.Runtime APIs.  This allows getting heap dumps from debugger process dumps.  
   * Global - An example of using PerfView's extensibility mechanism
   * CSVReader - old code that lets PerfView read .ETL.CSV files generated by XPERF (probably will delete)
-  * Zip - a clone of System.IO.Compression.dll so that PerfView can run on pre V4.5 runtimes (probably will delete)
+  * Zip - a clone of System.IO.Compression.dll so that PerfView can run on pre v4.5 runtimes (probably will delete)