update wechat contract method

README.md

@@ -17,7 +17,7 @@ The Kube-OVN community is waiting for you participation!
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 ## Features
 - **Namespaced Subnets**: Each Namespace can have a unique Subnet (backed by a Logical Switch). Pods within the Namespace will have IP addresses allocated from the Subnet. It's also possible for multiple Namespaces to share a Subnet.