git pull vs hg pull

[Uwe Brauer]

   > On Wed, Oct 28, 2015 at 1:36 PM, Uwe Brauer <oub at mat.ucm.es> wrote:

   >     Hello
   
   >     When I use git pull, to say pull a recent emacs git version
   >     git shows me which files has been upgraded, in nice graphical
   >     way.
   > the files. You can call it in a hook so it is called automatically
   > after a pull.

   > [hooks]
   > changegroup.diffstat=hg diff --stat -r %HG_NODE% -r tip

I added to my .hgrc file and run again
hg pull

And received

warning: changegroup.diffstat hook exited with status 255

Is my mercurial version (3.0.1) too old for that?