update geissonator id in maintainer file

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I91c7d461649998babe9eba43165433efc9d64732
diff --git a/MAINTAINERS b/MAINTAINERS
index e5878e0..0e0100e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -44,4 +44,4 @@
 
 M:  Brad Bishop <bradleyb@fuzziesquirrel.com> <radsquirrel!>
 R:  Brad Bishop <bradleyb@fuzziesquirrel.com> <radsquirrel!>
-R:  Andrew Geissler <geissonator@yahoo.com> <andrewg!>
+R:  Andrew Geissler <geissonator@yahoo.com> <geissonator!>