NEWS: document bug fix about virsh domstats on qemu < 5.2.0
NEWS: document bug fix about virsh domstats on qemu < 5.2.0

I think that virsh domstats problem on qemu < 5.2.0 is what users want
to find which version fixes.

Signed-off-by: Hiroki Narukawa <1632460cd8f08e71a75faaf4348ad5c5e0cee247@yahoo-corp.jp>
Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

olafhering/libvirt,crobinso/libvirt,nertpinx/libvirt,libvirt/libvirt,nertpinx/libvirt,jfehlig/libvirt,libvirt/libvirt,crobinso/libvirt,zippy2/libvirt,zippy2/libvirt,nertpinx/libvirt,jfehlig/libvirt,libvirt/libvirt,crobinso/libvirt,jfehlig/libvirt,jfehlig/libvirt,olafhering/libvirt,zippy2/libvirt,olafhering/libvirt,crobinso/libvirt,libvirt/libvirt,zippy2/libvirt,olafhering/libvirt,nertpinx/libvirt,nertpinx/libvirt