Set request encoding to identity to prevent Zlib::BufError

refer:

1. lostisland/faraday#337
2. jaimeiniesta/metainspector#125

lib/instagram_reporter/instagram_api_extensions.rb

@@ -190,6 +190,7 @@ def conn
           faraday.proxy    roll_proxy_server if roll_proxy_server.present?
           faraday.options.timeout = (ENV['INSTAGRAM_REQUEST_TIMEOUT_LIMIT'] || 15).to_i
           faraday.headers['User-Agent'] = USER_AGENT
+          faraday.headers['Accept-Encoding'] = 'identity'
         end
       end