4.0.0

• Major cleanup™ & moving things
  • use function/const everywhere
  • reduced complexity
  • code coverage
• removed classes & methods
  • HTTPClientInterface
    • HTTPClientInterface::request()
• added:
  • Psr18\LoggingClient
  • Psr18\URLExtractor
  • CurlUtils\CurlHandleInterface
  • CurlUtils\CurlMultiClient (a "Rolling-Curl" client that supports PSR-7 messages)
• composer dependency updates

The next major version will target PHP >= 7.4