Fix a typo

packages/0x.js/src/contract.ts

@@ -62,7 +62,7 @@ export class Contract implements Web3.ContractInstance {
                     txData = args.pop();
                 }
                 // Gas amount sourced with the following priorities:
-                // 1. Optional param passed it to public method call
+                // 1. Optional param passed in to public method call
                 // 2. Global config passed in at library instantiation
                 // 3. Gas estimate calculation + safety margin
                 const removeUndefinedProperties = _.pickBy;