Merge pull request #394 from michaelhly/solders-0.20 #828

Job	Run time
lint	1m 13s
tests (tests/integration/test_async_http_client.py)	1m 27s
tests (tests/integration/test_async_token_client.py)	1m 32s
tests (tests/integration/test_http_client.py)	1m 32s
tests (tests/integration/test_token_client.py)	1m 27s
tests (tests/integration/test_websockets.py)	2m 40s
tests (tests/integration/test_recent_performance_samples.py)	2m 26s
tests (tests/integration/test_memo.py)	1m 29s
tests (tests/unit)	55s
tests (src)	55s
test	1s
coverage	41s
	16m 18s

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