chore: regenerate README (#1016)

This PR was generated using Autosynth. 🌈


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

```
2020-12-10 17:14:21,657 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigquery/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2020-12-10 17:14:22,714 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/19fd8794-32fa-465f-8573-f14e4c6fe880/targets

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigquery.git",
-        "sha": "bb4039d7f89d4fc31f24567213b45d9ef7703de5"
+        "sha": "1999950da0e784b72c4dbe749ceb56d750cea1b3"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "7d1ee3207371ef72a1ca931a0964c4007e687280"
+        "sha": "352f25621c28d2fa0784984ea0ed5ea697aa1525"
       }
     }
   ]

README.md

@@ -268,6 +268,8 @@ Java 8 OSX | [![Kokoro CI][kokoro-badge-image-3]][kokoro-badge-link-3]
 Java 8 Windows | [![Kokoro CI][kokoro-badge-image-4]][kokoro-badge-link-4]
 Java 11 | [![Kokoro CI][kokoro-badge-image-5]][kokoro-badge-link-5]
 
+Java is a registered trademark of Oracle and/or its affiliates.
+
 [product-docs]: https://cloud.google.com/bigquery
 [javadocs]: https://googleapis.dev/java/google-cloud-bigquery/latest
 [kokoro-badge-image-1]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-bigquery/java7.svg