Updating changelog, modified the name of the package to python-diamond.

Please note that whenever preparing a release, you need to create an annotated
tag with the version number, git tag -am 'v3.2.2-wm1' v3.2.2-wm1

Change-Id: Ic30f632043c84c043d981d9a5f8f10d3d74e37d3
Signed-off-by: Giuseppe Lavagetto <glavagetto@wikimedia.org>