Updated README.md

Author: ip2location

README.md

@@ -22,7 +22,7 @@ Below are the methods supported in this module.
 |---|---|
 |open|Open the IP2Proxy BIN data with **File I/O** mode for lookup.|
 |close|Close and clean up the file pointer.|
-|get_package_version|Get the package version (1 to 10 for PX1 to PX11 respectively).|
+|get_package_version|Get the package version (1 to 11 for PX1 to PX11 respectively).|
 |get_module_version|Get the module version.|
 |get_database_version|Get the database version.|
 |is_proxy|Check whether if an IP address was a proxy. Please see [Proxy Type](#proxy-type) for details. Returned value:<ul><li>-1 : errors</li><li>0 : not a proxy</li><li>1 : a proxy</li><li>2 : a data center IP address</li></ul>|