README.md: Update name list of Technical Steering Committee

Replace Supreeth Venkatesh with Samer El-Haj-Mahmound who represents
Arm now.

Signed-off-by: Gilbert Chen <gilbert.chen@arm.com>
Change-Id: I3f0cfb8a130cf77228a0bf6d5b904526ef832e01
diff --git a/README.md b/README.md
index 71bd428..e4713ff 100644
--- a/README.md
+++ b/README.md
@@ -168,7 +168,7 @@
  * Sai Dasari, Facebook
  * James Mihm, Intel
  * Sagar Dharia, Microsoft
- * Supreeth Venkatesh, Arm
+ * Samer El-Haj-Mahmoud, Arm
 
 ## Contact
 - Mail: openbmc@lists.ozlabs.org [https://lists.ozlabs.org/listinfo/openbmc](https://lists.ozlabs.org/listinfo/openbmc)