fixed README

Author: Commandcracker

README.md

@@ -23,7 +23,8 @@ Look at the [documentation](https://display-server-interactions.readthedocs.io/e
 
 ```python
 from display_server_interactions import DSI
-window = DSI.get_active_window()
+dsi = DSI()
+window = dsi.get_active_window()
 ```
 
 ### Get basic window information

display_server_interactions/__init__.py

@@ -3,7 +3,7 @@
 
 from platform import system as __system
 
-__version__ = "0.0.dev2"
+__version__ = "0.0.dev3"
 __author__ = "Commandcracker"
 
 __os_name = __system().lower()