Archival message

Author: vitsalis

README.md

@@ -19,6 +19,9 @@ PyCG: Practical Call Graph Generation in Python.
 In _43rd International Conference on Software Engineering, ICSE '21_,
 25–28 May 2021.
 
+> **PyCG** is archived. Due to limited availability, no further development
+> improvements are planned.
+
 # Installation
 
 PyCG is implemented in Python3 and requires Python version 3.4 or higher.
@@ -140,4 +143,4 @@ pip3 install mock
 Τhen, simply run the tests by executing:
 ```
 make test
-```
+```