Reviewers: Replace Becca with Derick

Becca is no longer working on the OpenBMC project.
Derick has been reviewing code and pushing code to the WebUI
for some time. Please note the "Reviewer" tag has no official
power, it is a reference for who to add as a reviewer and
used by tools such as obmc-gerrit to automatically add reviewers.

Change-Id: I1d8c2d3626359b2b9f81329f6214d01ea46e13d5
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 663df40..35f957a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -44,4 +44,4 @@
 
 M:  Gunnar Mills <gmills@linux.vnet.ibm.com> <gunnarm!>
 M:  Ed Tanous <ed.tanous@intel.com> <edtanous!>
-R:  Becca Shaw <rebecca.shaw@ibm.com>
+R:  Derick Montague <derick.montague@ibm.com>