Fix import

Author: lizkenyon

packages/graphql-client/src/graphql-client/tests/graphql-client/fixtures.ts

@@ -1,7 +1,7 @@
 import { TextEncoder, TextDecoder } from "util";
 import { Readable } from "stream";
 
-import { ReadableStream } from "web-streams-polyfill/es2018";
+import { ReadableStream } from "web-streams-polyfill";
 
 import { createGraphQLClient } from "../../graphql-client";
 import {