chore: regenerate README (#533)

This PR was generated using Autosynth. 🌈


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

```
2021-04-12 20:18:34,516 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-automl/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-12 20:18:35,771 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/81f555e0-d8e8-4fe5-b973-f3d9417c79db/targets

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

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

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-automl.git",
-        "sha": "d8f8125421f6391ac279f6228a52c8ef1ada6222"
+        "sha": "e0e75bf6d757c3976cb7c195dc1de2b193ffa35d"
       }
     },
     {

README.md

@@ -52,7 +52,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-bigquery</artifactId>
-  <version>1.127.12</version>
+  <version>1.128.0</version>
 </dependency>
 <dependency>
   <groupId>com.google.cloud</groupId>