1.3.0

• Do not log request when loggin response again, but use UID to identify request
  that belongs to response.
  If you use a logger that does not log info severity and want the request
  logged when an error happened, use a Fingerscrossed log handler to also log
  info if any error is logged.
• Removed the request and response from the log context. They did not get
  printed because they don't implement __toString.
• Supporting the newly introduced message formatter method
  formatResponseForRequest that allows more flexibility in the formatter.
  See php-http/message#146