docs: update README (#19)

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Author: yoshi-automation

README.md

@@ -20,7 +20,7 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-gkehub</artifactId>
-  <version>0.0.0</version>
+  <version>0.1.0</version>
 </dependency>
 
 ```

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-gkehub.git",
-        "sha": "eb44a9c359ed224f0f7075933302bef37c9027ef"
+        "sha": "6a2bc22b344720259ebbaf9b886d2d5b280c5a15"
       }
     },
     {