btdigg engine: fix text mojibake.
Seeing on the official instance, searching with non-ascii character
usually renders mojibake non-sense:
http://searx.me/?q=%E9%A3%9F%E5%A0%82&categories=files
Screenshot with broken: 
Screenshot of the fixed rendering: 
commit01d2fb9f703fee2a28cdb4c6583158054f9d7558
authorKang-min Liu <gugod@gugod.org>
dateSun 19 Jul 2015, 20:44 (11 years ago)
parenta905e4e
searx/engines/btdigg.py+1−1
@@ -38,7 +38,7 @@ def request(query, params):
3838def response(resp):
3939 results = []
4040
41− dom = html.fromstring(resp.text)
41+ dom = html.fromstring(resp.content)
4242
4343 search_res = dom.xpath('//div[@id="search_res"]/table/tr')
4444