Do not use Exception.message, use str(Exception) instead

Author: depau

ffmpeg/tests/test_ffmpeg.py

@@ -365,5 +365,5 @@ def test_ffprobe():
 def test_ffprobe_exception():
     with pytest.raises(ffmpeg.ProbeException) as excinfo:
         ffmpeg.probe(BOGUS_INPUT_FILE)
-    assert excinfo.value.message == 'ffprobe error'
+    assert str(excinfo.value) == 'ffprobe error'
     assert 'No such file or directory' in excinfo.value.stderr_output