fix: version number

Justintime50 · Justintime50 · commit d2bcb741787a · 2024-07-17T11:08:01.000-06:00
diff --git a/pip_tree/_version.py b/pip_tree/_version.py
@@ -1 +1 @@
-__version__ = '3.2.0'
+__version__ = '4.0.0'
