add release notes for v2 bc (#28)

* add release notes for v2 bc

* custom

CHANGELOG.md

@@ -2,9 +2,18 @@
 
 All Notable changes to `gigya-client` will be documented in this file
 
+## 2.0 - 2017-10-17
+
+### Changed
+
+- [BC] Move all requests to use POST instead of GET to gigya.
+  - Prevents email/password leakage and some people are having issues with credentials in query params.
+  - If you use any custom `Handler`s that assume GET request or look at query params then they will need to change.
+
 ## 1.0 - 2016-12-02
 
 ### Changed
+
 - Upgrade Guzzle from v5 to v6
 - All Subscribers are now Guzzle Middleware
 - Renamed `->addSubscriber` to `->addHandler`
@@ -13,11 +22,13 @@ All Notable changes to `gigya-client` will be documented in this file
 ## 0.3 - 2016-04-02
 
 ### Added
+
 - OAuth2 authentication
 
 ## 0.2 - 2015-10-20
 
 ### Changed
+
 - Moved Subscribers and Validators to the Gigya object, call these directly
 - Constructor of Gigya takes a configuration array with properties
   - modification to the order of arguments
@@ -27,4 +38,5 @@ All Notable changes to `gigya-client` will be documented in this file
 ## 0.1 - 2015-10-03
 
 ### Added
+
 - initial Release