Bump version

README.rst

@@ -358,11 +358,11 @@ Please report bugs and suggestions at the `issue tracker <https://github.com/Ube
 
 How to cite this library (APA style):
 
-    Zhang, A. (2017). Speech Recognition (Version 3.7) [Software]. Available from https://github.com/Uberi/speech_recognition#readme.
+    Zhang, A. (2017). Speech Recognition (Version 3.8) [Software]. Available from https://github.com/Uberi/speech_recognition#readme.
 
 How to cite this library (Chicago style):
 
-    Zhang, Anthony. 2017. *Speech Recognition* (version 3.7).
+    Zhang, Anthony. 2017. *Speech Recognition* (version 3.8).
 
 Also check out the `Python Baidu Yuyin API <https://github.com/DelightRun/PyBaiduYuyin>`__, which is based on an older version of this project, and adds support for `Baidu Yuyin <http://yuyin.baidu.com/>`__. Note that Baidu Yuyin is only available inside China.
 

speech_recognition/__init__.py

@@ -22,7 +22,7 @@
 import uuid
 
 __author__ = "Anthony Zhang (Uberi)"
-__version__ = "3.7.1"
+__version__ = "3.8.0"
 __license__ = "BSD"
 
 try:  # attempt to use the Python 2 modules
@@ -310,8 +310,8 @@ def get_segment(self, start_ms=None, end_ms=None):
 
         If not specified, ``start_ms`` defaults to the beginning of the audio, and ``end_ms`` defaults to the end.
         """
-        assert start_ms is None or start_ms > 0, "``start_ms`` must be a positive number"
-        assert end_ms is None or end_ms > 0, "``end_ms`` must be a positive number"
+        assert start_ms is None or start_ms >= 0, "``start_ms`` must be a non-negative number"
+        assert end_ms is None or end_ms >= start_ms, "``end_ms`` must be a number greater or equal to ``start_ms``"
         if start_ms is None:
             start_byte = 0
         else: