chore: regenerate README (#545)

This PR was generated using Autosynth. 🌈


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

```
2021-04-19 14:46:21,208 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-automl/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-19 14:46:22,655 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/32af516a-068a-4591-80e7-2bc6c6eca9ed/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-automl.git",
-        "sha": "d7831fbda7d2f0a5a8c03a8b1bd23b8cac565790"
+        "sha": "94e6740599884cd1f3d6785fa8fb426f932f46d3"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "898b38a6f4fab89a76dfb152480bb034a781331b"
+        "sha": "ff6b759fcb58f216f62b48d5be0bb85fafbc3bb2"
       }
     }
   ]

README.md

@@ -17,7 +17,7 @@ If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>libraries-bom</artifactId>
-      <version>20.0.0</version>
+      <version>20.1.0</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>