Add src/utils entrypoint in README.md

Author: florianduros

README.md

@@ -185,12 +185,13 @@ client.startClient();
 
 As well as the primary entry point (`matrix-js-sdk`), there are several other entry points which may be useful:
 
-| Entry point                    | Description                                                                                         |
-| ------------------------------ | --------------------------------------------------------------------------------------------------- |
+| Entry point                    | Description                                                                                       |
+| ------------------------------ |---------------------------------------------------------------------------------------------------|
 | `matrix-js-sdk`                | Primary entry point. High-level functionality, and lots of historical clutter in need of a cleanup. |
-| `matrix-js-sdk/lib/crypto-api` | Cryptography functionality.                                                                         |
-| `matrix-js-sdk/lib/types`      | Low-level types, reflecting data structures defined in the Matrix spec.                             |
-| `matrix-js-sdk/lib/testing`    | Test utilities, which may be useful in test code but should not be used in production code.         |
+| `matrix-js-sdk/lib/crypto-api` | Cryptography functionality.                                                                       |
+| `matrix-js-sdk/lib/types`      | Low-level types, reflecting data structures defined in the Matrix spec.                           |
+| `matrix-js-sdk/lib/testing`    | Test utilities, which may be useful in test code but should not be used in production code.
+| `matrix-js-sdk/lib/utils`      | Standalone functions and their types                   |
 
 ## Examples