HTTPoison 1.4.0

• Run dialyzer as part of the travis build process #357 Thanks to @mmrobins
• Add support to max_body_length #354 #355 Thanks to @pedep
• Add HTTPoison.Request and process_response #311 #363 #364 #365 #366
• Deprecations:
  • process_headers/1 in favour of process_request_headers/1
  • process_status_code/1 in favour of process_response_status_code/1
  • process_url/1 in favour of process_request_url/1

Special thanks to @ryanwinchester 🎉