chore: update root entry point

Signed-off-by: Timur Bolotov <[email protected]>

index.ts

@@ -1,6 +1,7 @@
-import { Client } from './src'
-import { Serializer } from './src/transport'
+import { Client } from "./src";
+import { Serializer } from "./src/transport";
 
-
-export const client = new Client()
-export const serializer = new Serializer()
+export default {
+  Client,
+  Serializer,
+};