supported PostgreSQL versions?

Is 

Is see this commit (fix for pg15)
https://github.com/joncrlsn/pgdiff/commit/ef51a72904878a3662d0db0d6f0f5dfa25f10666

I also see the readme.md:
pgdiff compares the schema between two PostgreSQL 9 

What is the maximum pg version supported?


