chore: Replace TSLint with ESLint in contracts/utils,treasury,test-utils,erc20 (#589)

* replace TSLint with ESLint in contracts-utils

* also contracts/treasury

* also do test-utils

* yarn fix

* fix stuff yarn fix could not fix

* eslint erc20 contracts folder too

* changelogs

* actually zeroex was a different pr

* PR #589 in changelogs

* whitespace

* prettier

contracts/test-utils/src/web3_wrapper.ts

@@ -15,7 +15,7 @@ export const txDefaults = {
     gasPrice: constants.DEFAULT_GAS_PRICE,
 };
 
-export let providerConfigs: Web3Config = {
+export const providerConfigs: Web3Config = {
     total_accounts: constants.NUM_TEST_ACCOUNTS,
     shouldUseInProcessGanache: true,
     shouldAllowUnlimitedContractSize: true,