Fix reflect_table for alembic < 1.11.0 #274 #235

Job	Run time
3.7 CH=23.8.4.69	38s
3.7 CH=22.5.1.2079	34s
3.7 CH=19.3.5	48s
3.7 CH=18.14.9	31s
3.8 CH=23.8.4.69	37s
3.8 CH=22.5.1.2079	59s
3.8 CH=19.3.5	29s
3.8 CH=18.14.9	26s
3.9 CH=23.8.4.69	55s
3.9 CH=22.5.1.2079	34s
3.9 CH=19.3.5	41s
3.9 CH=18.14.9	43s
3.10 CH=23.8.4.69	39s
3.10 CH=22.5.1.2079	39s
3.10 CH=19.3.5	51s
3.10 CH=18.14.9	47s
3.11 CH=23.8.4.69	39s
3.11 CH=22.5.1.2079	58s
3.11 CH=19.3.5	47s
3.11 CH=18.14.9	48s
3.12 CH=23.8.4.69	1m 26s
3.12 CH=22.5.1.2079	1m 59s
3.12 CH=19.3.5	1m 16s
3.12 CH=18.14.9	1m 35s
Indicate completion to coveralls.io	11s
	20m 30s

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