Update README.md

Author: Daniel

README.md

@@ -17,7 +17,7 @@ Upsampling method for upsampling an input cloud using mls method of PCL 1.9.1
 
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 ## Compilation
-* Set "YOUR OWN" PCL Build DIR in CMakeList.txt e.g: **/opt/pcl-1.8.1/build** and save it.
+* Set "YOUR OWN" PCL Build DIR in CMakeList.txt e.g: **/opt/pcl-1.9.1/build** and save it.
 * Create a "build" folder
 
 in the main folder: