Latest version of com.google.cloud:google-cloud-spanner
https://javadoc.io/doc/com.google.cloud/google-cloud-spanner
Current version 0.21.1-beta
https://javadoc.io/doc/com.google.cloud/google-cloud-spanner/0.21.1-beta
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/com.google.cloud/google-cloud-spanner/0.21.1-beta/package-list