MAINTAINERS: Add Lei's IRC nickname

The IRC nickname for Lei was missing. Add it.

Change-Id: Ic6fa53c1a62d317d7afcfeaeda81d98807c1b589
Signed-off-by: Lei YU <mine260309@gmail.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index b5bca34..73059df 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -42,5 +42,5 @@
 START OF MAINTAINERS LIST
 -------------------------
 
-M:  Lei Yu <mine260309@gmail.com>
+M:  Lei Yu <mine260309@gmail.com> <LeiYU!>
 M:  Vishwanatha Subbanna <vishwa@linux.vnet.ibm.com> <vishwa!>