updted the list of dependencies for the java client

Author: or-else

README.md

@@ -109,7 +109,7 @@ When you register a new account you are asked for an email address to send valid
   * JSON or [protobuf version 3](https://developers.google.com/protocol-buffers/) wire protocols.
   * Bindings for various programming languages:
     * Javascript with no external dependencies.
-    * Java with dependencies on [Jackson](https://github.com/FasterXML/jackson) and [Java-Websocket](https://github.com/TooTallNate/Java-WebSocket). Suitable for Android but with no Android SDK dependencies.
+    * Java with dependencies on [Jackson](https://github.com/FasterXML/jackson), [Java-Websocket](https://github.com/TooTallNate/Java-WebSocket), [ICU4J](https://github.com/unicode-org/icu). Suitable for Android but with no Android SDK dependencies.
     * Swift with no external dependencies.
     * C/C++, C#, Go, Python, PHP, Ruby and many other languages using [gRPC](https://grpc.io/docs/languages/).
   * Choice of a database backend. Other databases can be added by writing [adapters](server/db/adapter.go).