Add MIT attribution for proof_util.ts
MODIFY
src/utils/proof_util.ts
src/utils/proof_util.ts
@@ -8,6 +8,8 @@ const rlp = ethUtils.rlp;
import EthereumBlock from 'ethereumjs-block/from-rpc';
import { Converter, promiseResolve, utils } from "..";
+// Implementation adapted from Tom French's `matic-proofs` library used under MIT License
+// https://github.com/TomAFrench/matic-proofs
export class ProofUtil {

Add MIT attribution for proof_util.ts