chore: regenerate README (#567)
chore: regenerate README (#567)

This PR was generated using Autosynth. :rainbow:


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

```
2021-08-03 19:18:39,440 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-recommender/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-08-03 19:18:40,664 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/8b8a2486-7051-4fa6-9078-482110427b1c/targets

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