Exporting formatIconUrlWithProxy to format iconUrl Proxy for tokens f…

…rom swaps api (#889)

* exporting formatIconUrlWithProxy to be used in extension for the swaps iconUrl proxy

* rearranging the export

src/index.ts

@@ -1,5 +1,6 @@
 import 'isomorphic-fetch';
 import * as util from './util';
+import { formatIconUrlWithProxy } from './assets/assetsUtil';
 
 export * from './assets/AccountTrackerController';
 export * from './user/AddressBookController';
@@ -39,4 +40,4 @@ export * from './permissions';
 export * from './subject-metadata';
 export * from './ratelimit/RateLimitController';
 export * from './notification/NotificationController';
-export { util };
+export { util, formatIconUrlWithProxy };