Update changelog for the 3.3.0 release

Author: mvantellingen

CHANGES

@@ -1,13 +1,11 @@
-3.3.1 (2019-03-05)
-------------------
- - Fix handling recursive xsd imports when the url's are enforced from http to
-   https.
-
-
-3.3.0 (2019-02-21)
+3.3.0 (2019-03-08)
 ------------------
  - Extend the force_https flag to also force loading xsd files from https when
    a http url is encountered from a https domain
+ - Fix handling recursive xsd imports when the url's are enforced from http to
+   https.
+ - Fix reference attribute when using the Binary Security Token (#873)
+ - Add support for the WSAM namespace (#890)
 
 
 3.2.0 (2018-12-17)