fix(eventstream-serde-browser): set module to dist output (#1434)

Author: hmaurer

packages/eventstream-serde-browser/package.json

@@ -10,7 +10,7 @@
     "test": "jest"
   },
   "main": "./dist/cjs/index.js",
-  "module": "./build/index.js",
+  "module": "./dist/es/index.js",
   "types": "./dist/cjs/index.d.ts",
   "author": {
     "name": "AWS SDK for JavaScript Team",