[compat] Fix casefold import __all__ syntax in a19855f

diff --git a/youtube_dl/casefold.py b/youtube_dl/casefold.py
index 748c2d49132abe894f5bb859e6cfe286ea097ea9..ad9c66f8ede352f138bcefd4d5e218a3b7ffbe70 100644 (file)
--- a/youtube_dl/casefold.py
+++ b/youtube_dl/casefold.py
@@ -1663,5 +1663,5 @@ def casefold(s):
 
 
 __all__ = [
-    casefold
+    'casefold',
 ]