Update README (#1133)

Streaming throwing an Audio Content too long error, investigating the issue, updating to shorter file in the meantime. 

Related issue: #1117

Author: nnegrey

speech/cloud-client/README.md

@@ -73,7 +73,7 @@ mvn exec:java -DRecognize -Dexec.args="model-selection gs://cloud-samples-tests/
 
 Perform streaming speech transcription on an audio file
 ```
-mvn exec:java -DRecognize -Dexec.args="streamrecognize ./resources/Google_Gnome.wav"
+mvn exec:java -DRecognize -Dexec.args="streamrecognize ./resources/audio.raw"
 ```
 
 ## Auto Punctuation