v2.4.0: bump version in setup.py

Author: catsika

setup.py

@@ -5,7 +5,7 @@
 
 setup(
     name="keymint",
-    version="2.3.1",
+    version="2.4.0",
     author="KeyMint",
     author_email="cliff@keymint.dev",
     description="License key validation, activation, and management for Python. Supports node-locking, offline licensing, and hardware fingerprinting.",