update CHANGES.md and README.md

Author: yfre

CHANGES.md

@@ -1,3 +1,13 @@
+# HAP-Java 2.0.0
+* major refactoring to support optional characteristics
+* structure and names are adapted to HAP spec structure and naming.
+* structure is following
+    * `accessory` package include basis accessory as the listed in HAP spec, plus interfaces for optional characteristics. clients should extend the accessory classes. e.g. `WindowCoveringAccessory` or `AccessoryWithBrightness`
+    * `characteristics` package consists of all characteristics, optional and mandatory. e.g. `TargetHorizontalTiltAngleCharacteristic`. The naming is done in accordance to HAP spec.
+    *  `services` package consists of services, which grouping characteristics. e.g. `WindowCoveringService` defines mandatory and optional characteristics for a window covering service as it is defined in HAP spec.
+    * `server` package consists classes to run homekit server and handle communication
+* the process is following: client, e.g. Openhab bindings, extends accessory classes, e.g. `WindowCoveringAccessory` and implements all required methods. WindowCoveringAccessory is linked already to WindowCoveringService, that in turn is link to single characteristics. 
+
 # HAP-Java 1.1.5
 
 ## Fixes

README.md

@@ -15,7 +15,7 @@ Include HAP-Java in your project using maven:
 <dependency>
 	<groupId>io.github.hap-java</groupId>
 	<artifactId>hap</artifactId>
-	<version>1.2.0-SNAPSHOT</version>
+	<version>2.0.0-SNAPSHOT</version>
 </dependency>
 ```