fix pep8

searx/engines/google_images.py

                    'week': 'w',
                    'month': 'm'}
 
+
 # do search-request
 def request(query, params):
     offset = (params['pageno'] - 1) * 100

searx/engines/yahoo.py

                    'week': ['1w', 'w'],
                    'month': ['1m', 'm']}
 
+
 # remove yahoo-specific tracking-url
 def parse_url(url_string):
     endings = ['/RS', '/RK']