Add voice selection by name (GoogleCloudPlatform#2687)

* Add voice selection by name

* Add future to requirements.txt

Fixes python2 test failures referencing html.

Co-authored-by: Leah E. Cole <[email protected]>

Author: texasmichelle

texttospeech/cloud-client/requirements.txt

@@ -1 +1,2 @@
+future==0.18.2
 google-cloud-texttospeech==0.5.0

texttospeech/cloud-client/synthesize_text.py

@@ -36,6 +36,7 @@ def synthesize_text(text):
     # Names of voices can be retrieved with client.list_voices().
     voice = texttospeech.types.VoiceSelectionParams(
         language_code='en-US',
+        name='en-US-Standard-C',
         ssml_gender=texttospeech.enums.SsmlVoiceGender.FEMALE)
 
     audio_config = texttospeech.types.AudioConfig(
@@ -68,6 +69,7 @@ def synthesize_ssml(ssml):
     # Names of voices can be retrieved with client.list_voices().
     voice = texttospeech.types.VoiceSelectionParams(
         language_code='en-US',
+        name='en-US-Standard-C',
         ssml_gender=texttospeech.enums.SsmlVoiceGender.FEMALE)
 
     audio_config = texttospeech.types.AudioConfig(