[enh] py3 compatibility

searx/engines/youtube_noapi.py

@@ -8,10 +8,10 @@
 # @stable      no
 # @parse       url, title, content, publishedDate, thumbnail, embedded
 
-from urllib import quote_plus
 from lxml import html
 from searx.engines.xpath import extract_text
 from searx.utils import list_get
+from searx.url_utils import quote_plus
 
 # engine dependent config
 categories = ['videos', 'music']