Edit README.md

Author: ciscorn

README.md

@@ -1,16 +1,14 @@
 # LDOCE5 Viewer
 
-***See this fork:***
-
-https://github.com/purboo/ldoce5viewer-pyqt5
+**:warning: This repository is no longer actively maintained.**
 
 -----
 
-![image](https://cloud.githubusercontent.com/assets/15828926/24585732/efb068a4-17bb-11e7-8294-7241f73d9ed8.png)
-
 The LDOCE5 Viewer is an alternative dictionary viewer for the Longman Dictionary of Contemporary English 5th Edition (LDOCE 5).
 
-It runs on Linux, Mac OS X and Microsoft Windows.
+![image](https://cloud.githubusercontent.com/assets/15828926/24585732/efb068a4-17bb-11e7-8294-7241f73d9ed8.png)
+
+It runs on macOS, Linux and Microsoft Windows.
 
 This software is free and open source software licensed under the terms of GPLv3.