Bump version to 0.4.0

Author: yuvipanda

setup.py

@@ -11,7 +11,7 @@
 
 setuptools.setup(
     name="nbresuse",
-    version="0.3.6",
+    version="0.4.0",
     url="https://github.com/yuvipanda/nbresuse",
     author="Yuvi Panda",
     description="Simple Jupyter extension to show how much resources (RAM) your notebook is using",