Update README.md

Author: jararap

README.md

@@ -7,7 +7,7 @@ Our formulation naturally relaxes to the well-studied weighted maximum coverage
 
     a. Using pip (use the lightweight source code w/o data/notebooks):
       ```
-      wget "https://github.com/PreferredAI/pcatt/archive/refs/tags/v0.11.tar.gz"
+      wget "https://github.com/PreferredAI/pcatt/archive/refs/tags/v0.13.tar.gz"
       unzip pcatt-0.10.zip -d pcatt
       cd pcatt
       pip install -r requirements.txt