Issue title: Difference between this RA vs the official one?
 Issue body: I am unable to find any information explaining the difference between this RA and the official one here: https://github.com/ClusterLabs/resource-agents/blob/master/heartbeat/pgsql ?

Thank you in advance.
 Comments: 
 Comment 0: I found this: https://clusterlabs.github.io/PAF/FAQ.html#why-new-ra-for-postgresql

But have no idea how up to date that info is.

I would also very much like to know which RA is recommenced for PostgresSQL in 2020. We're planning on using some RA for PostgreSQL 12. Which one is better ?
 Comment 1: > The only thing I found is https://clusterlabs.github.io/PAF/FAQ.html#why-new-ra-for-postgresql but I'm pretty sure that was written when PAF came out.

This link is accurate and was written when PAF cam out :)

> I would also very much like to know which RA is recommenced for PostgresSQL in 2020

Well, I suppose I am biased as an author of PAF. But at least I can tell you it is actively maintained.
 Comment 2: How safe is it to use PAF with PostgreSQL 12 at the moment. It's still in RC, any special reason ?
 Comment 3: > It's still in RC, any special reason ?

I'm just giving time for tests. I had 2 small fixes between rc1 and rc2. I plan to release next week.
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