chore: regenerate README (#87)

This PR was generated using Autosynth. 🌈


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

```
2020-12-14 18:44:24,945 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-security-private-ca/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2020-12-14 18:44:25,810 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/7824fb3d-8178-498d-9334-12dfede4183e/targets

- [ ] To automatically regenerate this PR, check this box.

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-security-private-ca.git",
-        "sha": "3bb647443ca9009f23695b32f514de81ef8a8b8b"
+        "sha": "20bd56acaaca0e007cff5176e42b5c17b01003fe"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "ba9918cd22874245b55734f57470c719b577e591"
+        "sha": "996775eca5fd934edac3c2ae34b80ff0395b1717"
       }
     }
   ]

README.md

@@ -111,6 +111,8 @@ 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/certificate-authority-service/docs
 [javadocs]: https://googleapis.dev/java/google-cloud-security-private-ca/latest/index.html
 [kokoro-badge-image-1]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-security-private-ca/java7.svg