[test_unicode_literals] Arm unicode_literals check

From now on, the line

from __future__ import unicode_literals

should be contained in every single Python file lest we run into any more 2.x/3.x issues.
Going forward, we're likely to develop on 3.x only and would likely miss subtle bugs otherwise.

1 files changed, 2 insertions, 0 deletions

diff --git a/youtube_dl/aes.py b/youtube_dl/aes.py
index 2eeb96a5a..5efd0f836 100644
--- a/youtube_dl/aes.py
+++ b/youtube_dl/aes.py
@@ -1,3 +1,5 @@
+from __future__ import unicode_literals
+
 __all__ = ['aes_encrypt', 'key_expansion', 'aes_ctr_decrypt', 'aes_cbc_decrypt', 'aes_decrypt_text']
 
 import base64