adding customization_id and switching from get to post in synthesize

Author: jsstylos

test/test_text_to_speech_v1.py

@@ -26,11 +26,10 @@ def test_success():
     assert responses.calls[0].response.text == voices_response
 
     synthesize_text = 'hello'
-    synthesize_url = 'https://stream.watsonplatform.net/text-to-speech/api/v1/synthesize?text=' + \
-        synthesize_text
+    synthesize_url = 'https://stream.watsonplatform.net/text-to-speech/api/v1/synthesize'
     synthesize_response_body = '<binary response>'
 
-    responses.add(responses.GET, synthesize_url,
+    responses.add(responses.POST, synthesize_url,
                   body=synthesize_response_body, status=200,
                   content_type='application/json', match_querystring=True)
     text_to_speech.synthesize(synthesize_text)

watson_developer_cloud/text_to_speech_v1.py

@@ -32,13 +32,14 @@ def __init__(self, url=default_url, username=None, password=None, use_vcap_servi
         WatsonDeveloperCloudService.__init__(
             self, 'text_to_speech', url, username, password, use_vcap_services)
 
-    def synthesize(self, text, voice=None, accept=None):
+    def synthesize(self, text, voice=None, accept=None, customization_id=None):
         """
         Returns the get HTTP response by doing a GET to /synthesize with text, voice, accept
         """
-        params = {'text': text, 'voice': voice, 'accept': accept}
+        params = {'voice': voice, 'accept': accept, 'customization_id': customization_id}
+        data = {'text': text}
         response = self.request(
-            method='GET', url='/v1/synthesize', stream=True, params=params)
+            method='POST', url='/v1/synthesize', stream=True, params=params, json=data)
         return response.content
 
     def voices(self):