ci skip: Update README.md

README.md

@@ -6,6 +6,9 @@
 ## spindle
 A distributed locking library built on top of [Cloud Spanner](https://cloud.google.com/spanner/). It relies on Spanner's [TrueTime](https://cloud.google.com/spanner/docs/true-time-external-consistency) and [transactions](https://cloud.google.com/spanner/docs/transactions) support to achieve its locking mechanism.
 
+Port(s):
+* [spindle-cb](https://github.com/flowerinthenight/spindle-cb) - relies on [aws/clock-bound](https://github.com/aws/clock-bound) and PostgreSQL
+
 Similar projects:
 * [DistributedLock](https://github.com/madelson/DistributedLock) - .NET
 * [Amazon DynamoDB Lock Client](https://github.com/awslabs/amazon-dynamodb-lock-client) - Java