Development Release 0.2.0

Please use this release with caution. Versions prior to 1.0.0
are considered development releases.

Changes

• [BREAKING] Removed Cakasim\Payone\Sdk\Api\Service::getClient()
• Added new proxy method Cakasim\Payone\Sdk\Api\Service::sendRequest()
• [BREAKING] Removed getUriFactory(), getStreamFactory(),
  getRequestFactory(), getResponseFactory() and getClient() from
  Cakasim\Payone\Sdk\Http\Service class
• Added new method Cakasim\Payone\Sdk\Http\Service::createServerRequest()
  that creates a PSR-7 server request from the current environment.
• The Cakasim\Payone\Sdk\Config\Config class now comes with a default
  configuration that is automatically applied. The following parameters
  have default values: api.endpoint, api.key_hash_type, api.mode,
  notification.sender_address_whitelist, redirect.token_lifetime,
  redirect.token_encryption_method and redirect.token_signing_algo
  [#22]
• [BREAKING] Moved PSR-7 HTTP message and PSR-17 HTTP factory components
  into separate package which is now available as cakasim/payone-sdk-http-message
• [BREAKING] Moved PSR-18 HTTP client component into separate package
  which is now available as cakasim/payone-sdk-stream-client
• [BREAKING] Moved PSR-3 logging component into separate package
  which is now available as cakasim/payone-sdk-silent-logger
• [BREAKING] Removed log component and service
• Use URL-safe Base64 encoding instead of Base62 for redirect tokens which
  fixes a strange IV length problem and drops the ext-gmp requirement
• The Cakasim\Payone\Sdk\Sdk class now has a getConfig() method
  for accessing the config more conveniently
• Implemented logging for the redirect and notification services
  [#14]
• Updated README in general and added a new section about the redirect service