Use ContractInstance from globals

src/globals.d.ts

@@ -47,7 +47,9 @@ declare module 'ethereumjs-util' {
 }
 
 // truffle-contract declarations
-declare interface ContractInstance {}
+declare interface ContractInstance {
+    address: string;
+}
 declare interface ContractFactory {
     setProvider: (providerObj: any) => void;
     deployed: () => ContractInstance;

src/types.ts

@@ -44,9 +44,6 @@ export interface ContractEventObj {
 }
 export type CreateContractEvent = (indexFilterValues: IndexFilterValues,
                                    subscriptionOpts: SubscriptionOpts) => ContractEventObj;
-export interface ContractInstance {
-    address: string;
-}
 export interface ExchangeContract extends ContractInstance {
     isValidSignature: {
         call: (signerAddressHex: string, dataHex: string, v: number, r: string, s: string,