chore: regenerate README (#350)

This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

```
2021-07-02 20:22:50,249 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-recommendations-ai/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-07-02 20:22:51,455 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/492dbfc3-5bdc-4392-8999-7d067b64743c/targets

- [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.)

.github/readme/synth.metadata/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-recommendations-ai.git",
-        "sha": "8937508ca230e009451ed12e7f733db34ebc0638"
+        "sha": "ae19bc57ccecf8abf12ce2027f2d88647935f0b4"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "c72e5beaba53532dc561094b2d8483e4da06921d"
+        "sha": "39652e3948f455fd0b77535a0145eeec561a3706"
       }
     }
   ]

README.md

@@ -21,19 +21,19 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-recommendations-ai</artifactId>
-  <version>0.6.0</version>
+  <version>0.6.1</version>
 </dependency>
 
 ```
 
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-recommendations-ai:0.6.0'
+compile 'com.google.cloud:google-cloud-recommendations-ai:0.6.1'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-recommendations-ai" % "0.6.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-recommendations-ai" % "0.6.1"
 ```
 
 ## Authentication