[fix] fix soundcloud engine, speed up searx start time

searx/engines/soundcloud.py

@@ -28,8 +28,10 @@ categories = ['music']
 paging = True
 
 # search-url
-url = 'https://api.soundcloud.com/'
+# missing attribute: user_id, app_version, app_locale
+url = 'https://api-v2.soundcloud.com/'
 search_url = url + 'search?{query}'\
+                         '&variant_ids='\
                          '&facet=model'\
                          '&limit=20'\
                          '&offset={offset}'\
@@ -57,7 +59,7 @@ def get_client_id():
             # gets app_js and searches for the clientid
             response = http_get(app_js_url)
             if response.ok:
-                cids = cid_re.search(response.text)
+                cids = cid_re.search(response.content.decode("utf-8"))
                 if cids is not None and len(cids.groups()):
                     return cids.groups()[0]
     logger.warning("Unable to fetch guest client_id from SoundCloud, check parser!")