[enh] update useragent versions

searx/utils.py

@@ -15,14 +15,14 @@ from searx import logger
 
 logger = logger.getChild('utils')
 
-ua_versions = ('33.0',
-               '34.0',
-               '35.0',
-               '36.0',
-               '37.0',
-               '38.0',
-               '39.0',
-               '40.0')
+ua_versions = ('40.0',
+               '41.0',
+               '42.0',
+               '43.0',
+               '44.0',
+               '45.0',
+               '46.0',
+               '47.0')
 
 ua_os = ('Windows NT 6.3; WOW64',
          'X11; Linux x86_64',