Add Dixsie as Maintainer

Dixsie has 80+ merged commits into webui-vue, is a top 3 contributor,
and active in the community including leading the GUI Design Work Group.

Change-Id: Ie3aa304d419d940ce8720c84ba1bae1d3ea32bd1
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 92adaa5..f4cc435 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -44,3 +44,4 @@
 
 M:  Derick Montague <derick.montague@ibm.com> <DerickM[m]!>
 M:  Gunnar Mills <gmills@linux.vnet.ibm.com> <gunnarm!>
+M:  Dixsie Wolmers <dixsie@ibm.com> <Dixsie!>