chore: remove build badges

b/468377909

Author: suztomo

README.md

@@ -542,29 +542,10 @@ information.
 
 Apache 2.0 - See [LICENSE][license] for more information.
 
-## CI Status
-
-Java Version | Status
------------- | ------
-Java 8 | [![Kokoro CI][kokoro-badge-image-2]][kokoro-badge-link-2]
-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/spanner/docs/
 [javadocs]: https://cloud.google.com/java/docs/reference/google-cloud-spanner/latest/history
-[kokoro-badge-image-1]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java7.svg
-[kokoro-badge-link-1]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java7.html
-[kokoro-badge-image-2]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java8.svg
-[kokoro-badge-link-2]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java8.html
-[kokoro-badge-image-3]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java8-osx.svg
-[kokoro-badge-link-3]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java8-osx.html
-[kokoro-badge-image-4]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java8-win.svg
-[kokoro-badge-link-4]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java8-win.html
-[kokoro-badge-image-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java11.svg
-[kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java11.html
 [stability-image]: https://img.shields.io/badge/stability-stable-green
 [maven-version-image]: https://img.shields.io/maven-central/v/com.google.cloud/google-cloud-spanner.svg
 [maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-spanner/6.105.0