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Document v3.6.3 in changelog #937

Job	Run time
check	48s
docs	1m 0s
py38 (ubuntu)	4m 50s
py39 (ubuntu)	4m 46s
py39 (windows)	6m 16s
py310 (ubuntu)	5m 1s
py310 (windows)	6m 16s
py311 (ubuntu)	4m 40s
py311 (macos)	4m 9s
py311 (windows)	7m 5s
Deploy docs to GitHub Pages	1m 4s
Upload coverage to Coveralls	4m 40s
	50m 35s

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