Summary:
More release branches are created. We should include them in continuous format compatibility checks.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5985

Test Plan: Let's see whether it is passes.

Differential Revision: D18226532

fbshipit-source-id: 75d8cad5b03ccea4ce16f00cea1f8b7893b0c0c8