chore: regenerate README (googleapis#649)

This PR was generated using Autosynth. 🌈


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

```
2021-07-27 00:58:51,858 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-translate/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-07-27 00:58:53,119 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/7075007b-2803-43b9-b4eb-f585a479401a/targets

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java-translate/.github/readme/synth.metadata/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-translate.git",
-        "sha": "dfabb6e1db91eb95c49dd3d8c713e05831e6247d"
+        "sha": "8bc058d758ba41e788ce75a910b975761fc8381a"
       }
     },
     {