chore: regenerate README (#489)
chore: regenerate README (#489)

This PR was generated using Autosynth. :rainbow:


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

```
2021-08-10 18:26:03,200 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-servicedirectory/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-08-10 18:26:05,010 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/fe8a6aa0-4dc2-485b-b50a-1d550a6c4b1e/targets

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googleapis/java-servicedirectory,googleapis/java-servicedirectory,googleapis/java-servicedirectory