Import FileDownloader in test_youtube_subtitles

Fix last commit

test/test_youtube_subtitles.py

@@ -12,6 +12,7 @@ sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 from youtube_dl.InfoExtractors import YoutubeIE
 from youtube_dl.utils import *
+from youtube_dl import FileDownloader
 
 PARAMETERS_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "parameters.json")
 with io.open(PARAMETERS_FILE, encoding='utf-8') as pf: