maintainers: Add William Kennington as maintainer

William has been hacking on sdbusplus a lot recently.  Enough so
that he is now the top contribtor in both commit count and LOC count
(not counting the original sdbusplus author).

William has demonstrated solid code and design principles, maintains
a presence in #openbmc and is very responsive to questions and feedback.

All of these make William the most qualified for sdbusplus maintainership.

Change-Id: I3bab20dbefa1bed5e076f1b021605a2f998690c0
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 6395b0c..572d444 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -42,7 +42,7 @@
 START OF MAINTAINERS LIST
 -------------------------
 
-M:  Brad Bishop <bradleyb@fuzziesquirrel.com> <radsquirrel!>
+M:  William Kennington <wak@google.com> <wak-work!>
 R:  Brad Bishop <bradleyb@fuzziesquirrel.com> <radsquirrel!>
 R:  Adriana Kobylak <anoo@us.ibm.com> <anoo!>
 R:  Deepak Kodihalli <dkodihal@linux.vnet.ibm.com> <dkodihal!>