0.19.0

Features:

• Backwards-incompatible: Refactor automatic documentation generation. At
  import time, each decorator stores information under its own namespace in
  the view function's _apidoc attribute. Then at app init time, the
  information is used to generate the docs. This allows access to init time
  parameters, such as OpenAPI version or application parameters like feature
  toggle flags, when generating the doc. Custom decorators storing doc in
  _apidoc must adapt by storing doc under their own name (e.g.:
  _apidoc['custom']), creating a doc preparation callback (e.g.:
  _prepare_custom_doc and appending this callback to
  Blueprint._prepare_doc_cbks. (:pr:123).

• Define all possible HTTP responses as response components and automatically
  document "error" responses: "Default Error" when @response is used,
  response returned by @arguments on client input error, and responses for
  304, 412 and 428 when @etag is used. Also document pagination header.
  (:pr:125).

• Document error response in @paginate decorator (:pr:126).

Bug fixes:

• Backwards-incompatible: Ensure pagination arguments are in query string.
  'page' and 'page_size' arguments passed in any other location are
  ignored by @paginate decorator. (:pr:127)