[Protocol3] install truffle-flattener (#435)

Loopring · Aug 16, 2019 · 6894293 · 6894293
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diff --git a/packages/loopring_v3/README.md b/packages/loopring_v3/README.md
@@ -87,3 +87,7 @@ If you have installed truffle globally, you can run:
 `npm run transpile && truffle migrate --network <network> --reset --dry-run`
 
 Replace network with `development`, `live`, `ropsten`, `koven`, etc.
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+## Etherscan.io Code Verification
+
+You can run `truffle-flattener <solidity-files>` to flatten a file. For contracts with constructor arguments, use https://abi.hashex.org/ to generated the argument string. To verify on etherscan.io, you also need to learn which libraries are linked to each contract from the migration scripts.