chore: regenerate README (#249)

This PR was generated using Autosynth. 🌈


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

```
2021-07-27 20:56:20,773 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-analytics-admin/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-07-27 20:56:22,136 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/292a8886-d5ca-4e5c-90b0-06422bb5562f/targets

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Author: yoshi-automation

.github/readme/synth.metadata/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-analytics-admin.git",
-        "sha": "9718b466d2decac7ce67497938811dde0aa38062"
+        "sha": "d22e529264c18408c18e708cfc1c050aae945b7c"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "387851d0e88ca4a5b1771ad63d915bed1bd4a740"
+        "sha": "3d32990b6f4b57be77455e3ca89e6e21cd0c06b3"
       }
     }
   ]