Add Nan Zhou as a reviewer

As requested by current maintainers in the following change,
[1] https://gerrit.openbmc.org/c/openbmc/phosphor-user-manager/+/58675

Add myself to the reviewer list so I can become a maintainer one day.

Signed-off-by: Nan Zhou <nanzhoumails@gmail.com>
Change-Id: Ie2102487873df88c28dedb3e4daaff8a345b9e11
1 file changed