[enh] py3 compatibility

searx/plugins/__init__.py

@@ -14,9 +14,12 @@ along with searx. If not, see < http://www.gnu.org/licenses/ >.
 
 (C) 2015 by Adam Tauber, <asciimoo@gmail.com>
 '''
-from sys import exit
+from sys import exit, version_info
 from searx import logger
 
+if version_info[0] == 3:
+    unicode = str
+
 logger = logger.getChild('plugins')
 
 from searx.plugins import (doai_rewrite,