actix-session 0.2.0

Session for actix web framework.
Documentation
# Changes

## [0.2.0] - 2019-07-08

*  Enhanced ``actix-session`` to facilitate state changes.  Use ``Session.renew()``
   at successful login to cycle a session (new key/cookie but keeps state).
   Use ``Session.purge()`` at logout to invalid a session cookie (and remove
   from redis cache, if applicable).

## [0.1.1] - 2019-06-03

* Fix optional cookie session support

## [0.1.0] - 2019-05-18

* Use actix-web 1.0.0-rc

## [0.1.0-beta.4] - 2019-05-12

* Use actix-web 1.0.0-beta.4

## [0.1.0-beta.2] - 2019-04-28

* Add helper trait `UserSession` which allows to get session for ServiceRequest and HttpRequest

## [0.1.0-beta.1] - 2019-04-20

* Update actix-web to beta.1

* `CookieSession::max_age()` accepts value in seconds

## [0.1.0-alpha.6] - 2019-04-14

* Update actix-web alpha.6

## [0.1.0-alpha.4] - 2019-04-08

* Update actix-web

## [0.1.0-alpha.3] - 2019-04-02

* Update actix-web

## [0.1.0-alpha.2] - 2019-03-29

* Update actix-web

* Use new feature name for secure cookies

## [0.1.0-alpha.1] - 2019-03-28

* Initial impl