++++++++++++++++++
Features:
* Add `resource_class_args` and `resource_class_kwargs` to `FlaskApiSpec.register` for passing constructor arguments to `MethodResource` classes. Thanks :user:`elatomo.`
* Add `FlaskApiSpec.init_app` method to support app factories (:issue:`21`). Thanks :user:`lafrech` for the suggestion and thanks :user:`dases` for the PR.
* Defer registering views until `init_app` is called. Thanks :user:`kageurufu` for the PR.
* Add support for documenting headers and query params (:issue:`32).` Thanks :user:`rodjjo.`
* Upon calling ``FlaskApiSpec(app)``, register rules which have already been registered on ``app`` (:issue:`48`). Thanks :user:`henryfjordan` for the fix.
Bug fixes:
* Return an empty list of parameters for undecorated views
(:issue:`48`). Thanks :user:`henryfjordan` for the fix.
Other changes:
- Test against Python 3.6. Drop support for Python 3.3.
- Support apispec>=0.17.0. Thanks :user:`rth` for fixing support for 0.20.0.