Flask-jwt-extended

I forgot to actually increase the version number on the 3.9.0 release. Whoops. Nothing new from 3.9.0 minus a the version number fix.

* Allows passing JWTs in via the query string (117). Note that in most cases this is not a great idea, see the documentation as to why.
* Break out code to verify JWTs in a request into helper functions. This allows you to easily create your own decorators that utilize this extension (such as a `role_required` decorator), or hook up functionality to a flask before_request. (131)

* Allow option to unset access and refresh cookies independently of each other (148)

* Fixes JSON encoder added in 3.8.0 (140)

* Default to the Flask JSON encoder and allows for custom JSON encoders for encoding JWTs (139)

* Fixes a CSRF error when using jwts in cookies and the `jwt_optional` decorator (129)