release 5.3.1

Author: takluyver

notebook/_version.py

@@ -9,5 +9,5 @@
 
 # Next beta/alpha/rc release: The version number for beta is X.Y.ZbN **without dots**. 
 
-version_info = (5, 4, 0, '.dev0')
+version_info = (5, 3, 1)
 __version__ = '.'.join(map(str, version_info[:3])) + ''.join(version_info[3:])