Add typings #518

Job	Run time	Billable time
test-postgres (9.5)	3m 6s	0s
test-postgres (9.6)	3m 5s	0s
test-platforms (3.8, ubuntu-latest, asyncio)	2m 10s	0s
test-postgres (10)	2m 28s	0s
test-platforms (3.8, ubuntu-latest, uvloop)	2m 9s	0s
test-postgres (11)	2m 35s	0s
test-platforms (3.8, macos-latest, asyncio)	2m 52s	0s
test-postgres (12)	2m 40s	0s
test-platforms (3.8, macos-latest, uvloop)	3m 32s	0s
test-postgres (13)	2m 33s	0s
test-platforms (3.8, windows-latest, asyncio)	6m 23s	0s
test-postgres (14)	2m 28s	0s
test-platforms (3.9, ubuntu-latest, asyncio)	2m 6s	0s
test-postgres (15)	3m 43s	0s
test-platforms (3.9, ubuntu-latest, uvloop)	2m 7s	0s
test-postgres (16)	2m 31s	0s
test-platforms (3.9, macos-latest, asyncio)	3m 43s	0s
test-platforms (3.9, macos-latest, uvloop)	3m 32s	0s
test-platforms (3.9, windows-latest, asyncio)	5m 27s	0s
test-platforms (3.10, ubuntu-latest, asyncio)	2m 1s	0s
test-platforms (3.10, ubuntu-latest, uvloop)	2m 2s	0s
test-platforms (3.10, macos-latest, asyncio)	3m 6s	0s
test-platforms (3.10, macos-latest, uvloop)	2m 40s	0s
test-platforms (3.10, windows-latest, asyncio)	4m 58s	0s
test-platforms (3.11, ubuntu-latest, asyncio)	2m 7s	0s
test-platforms (3.11, ubuntu-latest, uvloop)	2m 1s	0s
test-platforms (3.11, macos-latest, asyncio)	3m 33s	0s
test-platforms (3.11, macos-latest, uvloop)	3m 50s	0s
test-platforms (3.11, windows-latest, asyncio)	5m 37s	0s
test-platforms (3.12, ubuntu-latest, asyncio)	2m 2s	0s
test-platforms (3.12, macos-latest, asyncio)	3m 52s	0s
test-platforms (3.12, windows-latest, asyncio)	5m 33s	0s
Regression Tests	1s	0s
	1h 42m 33s	0s

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