Test

Add compatibility matrix in `README.md` (#41) #213

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Run time

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Job	Run time
Tests / Tests (PostgreSQL 15)	3m 45s
Tests / Tests (PostgreSQL 17)	10m 2s
Tests / Tests (PostgreSQL 16)	4m 4s
Tests / Tests (PostgreSQL 18)	4m 3s
Tests / Tests (PostgreSQL 17)	4m 11s
Tests / Tests (PostgreSQL 18)	4m 3s
Tests / Tests (PostgreSQL 16)	4m 4s
Tests / Tests (PostgreSQL 15)	3m 45s
	37m 57s