Update setup.py

Author: alexlib

setup.py

@@ -76,7 +76,7 @@
 
 
 setup(  name = "OpenPIV",
-        version = "0.19",
+        version = "0.20.1",
         author = "The OpenPIV contributors",
         author_email = "[email protected]",
         description = "An open source software for PIV data analysis",