Add version 2.5.2.

var/spack/repos/builtin/packages/py-dateutil/package.py

@@ -7,6 +7,7 @@ class PyDateutil(Package):
 
     version('2.4.0', '75714163bb96bedd07685cdb2071b8bc')
     version('2.4.2', '4ef68e1c485b09e9f034e10473e5add2')
+    version('2.5.2', 'eafe168e8f404bf384514f5116eedbb6')
 
     extends('python')
     depends_on('py-setuptools')