Update CHANGELOG.md with 2.9.1 changes.

Update version numbers in documentation (2.9.0 -> 2.9.1).

CHANGELOG.md

@@ -1,6 +1,20 @@
 Change Log
 ==========
 
+## Version 2.9.1
+
+* Make `Object` and `JsonElement` deserialization iterative rather than
+  recursive (#1912)
+* Added parsing support for enum that has overridden toString() method (#1950)
+* Removed support for building Gson with Gradle (#2081)
+* Removed obsolete `codegen` hierarchy (#2099)
+* Add support for reflection access filter (#1905)
+* Improve `TypeToken` creation validation (#2072)
+* Add explicit support for `float` in `JsonWriter` (#2130, #2132)
+* Fail when parsing invalid local date (#2134)
+
+Also many small improvements to javadoc.
+
 ## Version 2.9.0
 
 **The minimum supported Java version changes from 6 to 7.**

README.md

@@ -19,7 +19,7 @@ There are a few open-source projects that can convert Java objects to JSON. Howe
 Gradle:
 ```gradle
 dependencies {
-  implementation 'com.google.code.gson:gson:2.9.0'
+  implementation 'com.google.code.gson:gson:2.9.1'
 }
 ```
 
@@ -28,7 +28,7 @@ Maven:
 <dependency>
   <groupId>com.google.code.gson</groupId>
   <artifactId>gson</artifactId>
-  <version>2.9.0</version>
+  <version>2.9.1</version>
 </dependency>
 ```
 

UserGuide.md

@@ -76,7 +76,7 @@ The Gson instance does not maintain any state while invoking JSON operations. So
 
 ```gradle
 dependencies {
-    implementation 'com.google.code.gson:gson:2.9.0'
+    implementation 'com.google.code.gson:gson:2.9.1'
 }
 ```
 
@@ -90,7 +90,7 @@ To use Gson with Maven2/3, you can use the Gson version available in Maven Centr
     <dependency>
       <groupId>com.google.code.gson</groupId>
       <artifactId>gson</artifactId>
-      <version>2.9.0</version>
+      <version>2.9.1</version>
       <scope>compile</scope>
     </dependency>
 </dependencies>