[docs] Update docs for version 2.0.0-beta2

Original commit: elastic/x-pack-elasticsearch@b4af10f8f0

watcher/docs/index.asciidoc

@@ -7,7 +7,7 @@
 :java-client-ref: 	http://www.elastic.co/guide/en/elasticsearch/client/java-api/current
 :blog-ref:			https://www.elastic.co/blog/
 :forum:				https://discuss.elastic.co/c/watcher
-:version:           2.0.0-beta1
+:version:           2.0.0-beta2
 
 include::introduction.asciidoc[]
 

watcher/docs/reference/java.asciidoc

@@ -36,7 +36,7 @@ If you use Maven to manage dependencies, add the following to the `pom.xml`:
       <dependency>
          <groupId>org.elasticsearch.plugin</groupId>
          <artifactId>elasticsearch-watcher</artifactId>
-         <version>2.0.0-beta1</version>
+         <version>2.0.0-beta2</version>
       </dependency>
       ...
    </dependencies>
@@ -60,7 +60,7 @@ repositories {
 
 dependencies {
   // Provide the Watcher jar on the classpath for compilation and at runtime
-  compile "org.elasticsearch.plugin:elasticsearch-watcher:2.0.0-beta1"
+  compile "org.elasticsearch.plugin:elasticsearch-watcher:2.0.0-beta2"
 
   /* ... */
 }

watcher/docs/release-notes.asciidoc

@@ -36,6 +36,15 @@ bin/plugin remove watcher
 [[change-list]]
 === Change List
 
+[float]
+==== 2.0.0-beta2
+
+.New Features
+* Added new <<actions-hipchat, HipChat Action>>
+* Added new <<actions-slack, Slack Action>>
+* Watches now have an <<watch-active-state, active state>>. In addition, a new API was added to
+  <<api-rest-activate-watch, activate>>/<<api-rest-deactivate-watch, deactivate>> registered watches.
+
 [float]
 ==== 2.0.0-beta1