v1.1.0

• add flag to allow video/* as content type (disabled by default)
• allow setting custom server name
• add flag to expose the current version version in http response header
  (similar to how it is done for -V cli output)
• change root route to return 404
• add /healthcheck route that returns 204 status (no body content)
  useful for load balancers to check that service is running