chore: regenerate README (#451)
chore: regenerate README (#451)

This PR was generated using Autosynth. :rainbow:


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

```
2021-07-27 23:00:29,680 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-memcache/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-07-27 23:00:30,991 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/06293c35-8ae8-4e49-9325-be2108351096/targets

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