Speech version bump [(#899)](#899)

* Changes docs for async playback to point to LINEAR16 example
* Updates to client library with FLAC support.
* Changes async examples to flac and updates README

Author: gguuss

speech/snippets/requirements.txt

@@ -1 +1 @@
-google-cloud-speech==0.25.0
+google-cloud-speech==0.25.1

speech/snippets/transcribe_async.py

@@ -19,7 +19,7 @@
 
 Example usage:
     python transcribe_async.py resources/audio.raw
-    python transcribe_async.py gs://cloud-samples-tests/speech/brooklyn.raw
+    python transcribe_async.py gs://cloud-samples-tests/speech/brooklyn.flac
 """
 
 import argparse
@@ -67,7 +67,7 @@ def transcribe_gcs(gcs_uri):
     audio_sample = speech_client.sample(
         content=None,
         source_uri=gcs_uri,
-        encoding='LINEAR16',
+        encoding='FLAC',
         sample_rate_hertz=16000)
 
     operation = audio_sample.long_running_recognize('en-US')

speech/snippets/transcribe_async_test.py

@@ -29,7 +29,7 @@ def test_transcribe(capsys):
 
 def test_transcribe_gcs(capsys):
     transcribe_async.transcribe_gcs(
-        'gs://python-docs-samples-tests/speech/audio.raw')
+        'gs://python-docs-samples-tests/speech/audio.flac')
     out, err = capsys.readouterr()
 
     assert re.search(r'how old is the Brooklyn Bridge', out, re.DOTALL | re.I)