[doc] changelog added

0.6.0

=====

-  Changelog added

-  New engines

   -  Flickr (api)

   -  Subtitleseeker

   -  photon

   -  500px

   -  Searchcode

   -  Searchcode doc

   -  Kickass torrent

-  Precise search request timeout handling

-  Better favicon support

-  Stricter config parsing

-  Translation updates

-  Multiple ui fixes

-  Flickr (noapi) engine fix

-  Pep8 fixes

News

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Health status of searx instances and engines: http://stats.searx.oe5tpo.com

(source: https://github.com/pointhi/searx_stats)