chore: regenerate README (#508)

This PR was generated using Autosynth. 🌈


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

```
2021-08-19 17:26:39,053 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-webrisk/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-08-19 17:26:40,084 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/51de43f0-9c41-4d53-a75e-f10891ae5ecf/targets

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

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-webrisk.git",
-        "sha": "ebe00c1a79f5ce41036a1a61abf9e58811593b70"
+        "sha": "73366eec426047d8a84cc13b4e622e7fe4d9a771"
       }
     },
     {

README.md

@@ -41,7 +41,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-webrisk</artifactId>
-  <version>1.2.2</version>
+  <version>2.0.1</version>
 </dependency>
 
 ```