Add link to Rust bindings (#933)

README.md

@@ -66,6 +66,7 @@ See the [wiki](https://github.com/edenhill/librdkafka/wiki) for a FAQ.
   * Python: [confluent-kafka-python](https://github.com/confluentinc/confluent-kafka-python)
   * Python: [PyKafka](https://github.com/Parsely/pykafka)
   * Ruby: [Hermann](https://github.com/stancampbell3/Hermann)
+  * Rust: [rust-rdkafka](https://github.com/fede1024/rust-rdkafka)
   * Tcl: [KafkaTcl](https://github.com/flightaware/kafkatcl)
   * C#/.NET: [rdkafka-dotnet](https://github.com/ah-/rdkafka-dotnet)
   * D (C-like): [librdkafka](https://github.com/DlangApache/librdkafka/)