v3.1.1

• Language detection is not experimental feature now.
• getLastDetectedSource() can be called both statically and non-statically.
• Added third parameter $options for advanced configuration of Guzzle HTTP client. (@vkollin)
  • Supports proxy servers
  • Custom User-Agent and any other headers.
  • Anything available in Guzzle client configuration options
• Switched to PSR-2 coding style. (@subsan)