Update README.md: Adjust Windows default path (#20)

README.md

@@ -13,7 +13,7 @@ This plugin is distributed under the [GNU GPL v3 license](https://github.com/ope
 
 ### pg_service.conf location
 
-If your `pg_service.conf` file is located at `/home/YOUR_USER/.pg_service.conf` (on Linux) or at `%APPDATA%\postgresql\.pg_service.conf` (on Windows), then you are done! The plugin will read your file directly.
+If your `pg_service.conf` file is located at `/home/YOUR_USER/.pg_service.conf` (on Linux) or at `%HOMEPATH%\.pg_service.conf` (on Windows), then you are done! The plugin will read your file directly.
 
 If that's not the case, i.e., if your `pg_service.conf` file is not in the aforementioned locations, you can still set the `PGSERVICEFILE` environment variable pointing to your `pg_service.conf` file path before using the plugin.