chore: regenerate README (#270)
chore: regenerate README (#270)

This PR was generated using Autosynth. :rainbow:


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

```
2021-07-28 20:14:55,740 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-analytics-data/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-07-28 20:14:57,063 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/bd8d5b3c-845c-4f2a-8d78-1ef2e9253669/targets

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googleapis/java-analytics-data,googleapis/java-analytics-data,googleapis/java-analytics-data