Output for elasticsearch v6+

[superhua]

when I want to save result for elastic stack, I use ./whatweb [host]--log-elastic-host=localhost:9200 , but I get error message:

{"error":"Content-Type header [application/x-www-form-urlencoded] is not supported","status":406}

According to the message, edit file lib/output.rb and add req.add_field('Content-Type', 'application/json') in line 960 of the file will fix this error.

[Andrew Horton]

Thanks @superhuahua for reporting this issue and providing a fix.