chore: regenerate README (googleapis#556)

This PR was generated using Autosynth. 🌈


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

```
2021-07-27 21:37:32,699 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-resourcemanager/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-07-27 21:37:33,943 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/21c0a5f7-96f0-4f6b-b6c3-09626b1e917a/targets

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Author: yoshi-automation

java-resourcemanager/.github/readme/synth.metadata/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-resourcemanager.git",
-        "sha": "1139153f5928009a6dfc5a41a6a7fa3689936690"
+        "sha": "c6cdad935647e2b55519e8d05685ea8dfba920ce"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "e44dc0c742b1230887a73552357e0c18dcc30b92"
+        "sha": "3d32990b6f4b57be77455e3ca89e6e21cd0c06b3"
       }
     }
   ]