OWNERS: Add Ravi Teja as a owner

I have worked on various features and fixed several issues in this
user-manager repository and redfish AccountService

I have a thorough understanding of LDAP and user-manager
Thus, I am applying to be a maintainer of this repo. Hope i can
contribute more and help the OpenBMC community.

Here is my contributions in this repository
[1] https://github.com/openbmc/phosphor-user-manager/commits?author=raviteja-b

Change-Id: I50c689ebf5dbcb9f0ea28d3a8de0decdc0069b9b
Signed-off-by: Ravi Teja <raviteja28031990@gmail.com>
diff --git a/OWNERS b/OWNERS
index 882e148..d6b3c3a 100644
--- a/OWNERS
+++ b/OWNERS
@@ -33,10 +33,10 @@
 
 owners:
 - ratankgupta31@gmail.com
+- raviteja28031990@gmail.com
 
 reviewers:
 - nanzhoumails@gmail.com
-- raviteja28031990@gmail.com
 
 matchers: