set version 0.4.0

Author: pplonski

setup.py

@@ -10,7 +10,7 @@
 
 setup(
     name="supertree",
-    version="0.3.2",
+    version="0.4.0",
     description="Visualize decision tree in Python",
     long_description=long_description,
     long_description_content_type="text/markdown",