update version to 0.4.0 (#47)

Author: ArneBinder

setup.py

@@ -25,7 +25,7 @@
 
 setup(
     name="pie-utils",
-    version="0.3.0",
+    version="0.4.0",
     description="A collection of utilities to easy the usage of PyTorch-IE",
     author="Arne Binder",
     author_email="[email protected]",