docs(readme): Restore uuid in Additional code section (#511)

Summary:

This was removed along with the change to use the uuid function exported by the utils package. But, we are listing all additional code from transitive dependencies here (for example, decompress-response), not just direct dependencies.

Test plan:

None. Docs-only change.

Author: mjc1283

packages/optimizely-sdk/README.md

@@ -100,6 +100,10 @@ Prod dependencies are as follows:
     "licenses": "MIT*",
     "repository": "https://github.com/perezd/node-murmurhash"
   },
+  "uuid@3.3.2": {
+    "licenses": "MIT",
+    "repository": "https://github.com/kelektiv/node-uuid"
+  },
   "decompress-response@4.2.1": {
     "licenses": "MIT",
     "repository": "https://github.com/sindresorhus/decompress-response"