Update README.md

lychees · lychees · commit 320760f24119 · 2019-09-28T13:17:49.000+08:00
diff --git a/README.md b/README.md
@@ -11,4 +11,6 @@ node handler.js
 ### Proxy
 node proxy.js
 ### Contracts
+rm -rf ./build
+truffle deploy --network ropsten
 Check here: https://juejin.im/post/5adedbad6fb9a07acb3c81bb
