Fixes path issue in test

The test path wasn't setup to work properly in travis.

Author: Joshua B. Smith

test/test_speech_to_text_v1.py

@@ -128,10 +128,11 @@ def test_custom_corpora():
 
     speech_to_text.list_corpora(customization_id='customid')
 
-    file_path = './resources/speech_to_text/corpus-short-1.txt'
-    with open(file_path) as f:
+    file_path = '../resources/speech_to_text/corpus-short-1.txt'
+    full_path = os.path.join(os.path.dirname(__file__), file_path)
+    with open(full_path) as corpus_file:
         speech_to_text.add_corpora(customization_id='customid',
-                                   corpus_name="corpus",file=f)
+                                   corpus_name="corpus",file=corpus_file)
 
     speech_to_text.get_corpus(customization_id='customid',
                               corpus_name='corpus')