Update CHANGELOG and README for release 21.0.0 (#666)

Author: jradcliff

CHANGELOG.md

@@ -1,3 +1,11 @@
+21.0.0 - 2022-08-23
+-------------------
+- Add support and examples for Google Ads API v11.1.
+- Update to version 2.8.0 of
+  `com.google.cloud:google-cloud-shared-dependencies`.
+- Update to version 1.5.3 of `com.google.auth:google-auth-library-credentials`.
+- Replace ETA examples with RSA examples.
+
 20.0.0 - 2022-07-19
 -------------------
 - Remove support for v9 of Google Ads API.

README.md

@@ -15,20 +15,20 @@ This project hosts the Java client library for the Google Ads API.
 
 ## Compatible dependencies
 
-  * [Protobuf](https://github.com/protocolbuffers/protobuf) 3.12.0+
-  * [Guava](https://github.com/google/guava) 30.0+
+  * [Protobuf](https://github.com/protocolbuffers/protobuf) 3.19.4+
+  * [Guava](https://github.com/google/guava) 31.0.1+
 
 ## Maven artifacts
 
     <dependency>
       <groupId>com.google.api-ads</groupId>
       <artifactId>google-ads</artifactId>
-      <version>20.0.0</version>
+      <version>21.0.0</version>
     </dependency>
 
 ## Gradle dependency
 
-    implementation 'com.google.api-ads:google-ads:20.0.0'
+    implementation 'com.google.api-ads:google-ads:21.0.0'
 
 ## Documentation