MLECO-1253: update ASR example python app

* add link to new wav2letter model from ModelZoo in Readme
* update model input size
* update to match new model's output

Signed-off-by: Nina Drozd <nina.drozd@arm.com>
Change-Id: I8e85d025610a458e9ae7be93fd7179c71bac5b18
diff --git a/python/pyarmnn/examples/speech_recognition/audio_capture.py b/python/pyarmnn/examples/speech_recognition/audio_capture.py
index 9f28d10..0c89920 100644
--- a/python/pyarmnn/examples/speech_recognition/audio_capture.py
+++ b/python/pyarmnn/examples/speech_recognition/audio_capture.py
@@ -20,7 +20,7 @@
         self.mono = True
         self.dtype = np.float32
         self.samplerate = 16000
-        self.min_samples = 167392
+        self.min_samples = 47712  # (model_input_size-1)*stride + frame_len
 
 
 class AudioCapture: