MAINTAINERS: Stylize GunnarM Discord Username

Change-Id: I88ca2b2ff42a66b177a85f3ebdb6910fbcb7a391
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index e9c5401..69fc551 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -44,4 +44,4 @@
 
 M:  Ed Tanous <ed@tanous.net> <edtanous!>
 M:  Jason Bills <jason.m.bills@linux.intel.com> <jmbills!>
-M:  Gunnar Mills <gmills@linux.vnet.ibm.com> <gunnarm!>
+M:  Gunnar Mills <gmills@linux.vnet.ibm.com> <GunnarM!>