Add support for READ UNCOMMITTED (#1039) #398

Job	Run time
test-postgres (9.5)	3m 7s
test-postgres (9.6)	3m 14s
test-postgres (10)	2m 45s
test-postgres (11)	3m 12s
test-postgres (12)	2m 52s
test-postgres (13)	2m 48s
test-postgres (14)	3m 22s
test-postgres (15)	3m 6s
test-platforms (3.7, ubuntu-latest, asyncio)	2m 33s
test-platforms (3.7, ubuntu-latest, uvloop)	2m 37s
test-platforms (3.7, macos-latest, asyncio)	3m 18s
test-platforms (3.7, macos-latest, uvloop)	3m 19s
test-platforms (3.7, windows-latest, asyncio)	5m 59s
test-platforms (3.8, ubuntu-latest, asyncio)	2m 23s
test-platforms (3.8, ubuntu-latest, uvloop)	2m 32s
test-platforms (3.8, macos-latest, asyncio)	3m 2s
test-platforms (3.8, macos-latest, uvloop)	3m 29s
test-platforms (3.8, windows-latest, asyncio)	7m 13s
test-platforms (3.9, ubuntu-latest, asyncio)	2m 18s
test-platforms (3.9, ubuntu-latest, uvloop)	2m 17s
test-platforms (3.9, macos-latest, asyncio)	3m 59s
test-platforms (3.9, macos-latest, uvloop)	3m 19s
test-platforms (3.9, windows-latest, asyncio)	6m 7s
test-platforms (3.10, ubuntu-latest, asyncio)	2m 4s
test-platforms (3.10, ubuntu-latest, uvloop)	2m 17s
test-platforms (3.10, macos-latest, asyncio)	3m 3s
test-platforms (3.10, macos-latest, uvloop)	3m 20s
test-platforms (3.10, windows-latest, asyncio)	6m 52s
test-platforms (3.11, ubuntu-latest, asyncio)	2m 5s
test-platforms (3.11, ubuntu-latest, uvloop)	2m 16s
test-platforms (3.11, macos-latest, asyncio)	3m 19s
test-platforms (3.11, macos-latest, uvloop)	3m 13s
test-platforms (3.11, windows-latest, asyncio)	6m 47s
Regression Tests	1s
	1h 54m 8s

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