Add sivchari to reviewer

Signed-off-by: sivchari <[email protected]>

Author: sivchari

config/jobs/kubernetes-sigs/cluster-api/OWNERS

@@ -8,6 +8,7 @@ reviewers:
 - sbueringer
 - neolit123
 - vincepri
+- sivchari
 approvers:
 - chrischdi
 - fabriziopandini