[fix] yahoo engine - changed content_xpath

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/engines/yahoo.py

@@ -33,7 +33,7 @@ supported_languages_url = 'https://search.yahoo.com/web/advanced'
 results_xpath = "//div[contains(concat(' ', normalize-space(@class), ' '), ' Sr ')]"
 url_xpath = './/h3/a/@href'
 title_xpath = './/h3/a'
-content_xpath = './/div[@class="compText aAbs"]'
+content_xpath = './/div[contains(@class, "compText")]'
 suggestion_xpath = "//div[contains(concat(' ', normalize-space(@class), ' '), ' AlsoTry ')]//a"
 
 time_range_dict = {'day': ['1d', 'd'],