Correct release title, artist in test case

Signed-off-by: ABCbum <[email protected]>

whipper/test/test_common_mbngs.py

@@ -49,7 +49,7 @@ def testClassicalTrack(self):
         Test if composers and performers are extracted properly
         see https://github.com/whipper-team/whipper/issues/191
         """
-        # Using: Début Recital - Martha Argerich
+        # Using: Mama Said - Lenny Kravitz
         # https://musicbrainz.org/release/410f99f8-a876-3416-bd8e-42233a00a477
         filename = 'whipper.release.410f99f8-a876-3416-bd8e-42233a00a477.json'
         path = os.path.join(os.path.dirname(__file__), filename)