Add DayOfWeek ToSchema instance. #55

Job	Run time
build and test (stack) (ubuntu-latest)	10m 19s
build and test (stack) (macOS-latest)	15m 48s
build and test (cabal) (8.6.5, 3.10.2.0, ubuntu-latest)	7m 2s
build and test (cabal) (8.6.5, 3.10.2.0, macOS-latest)	14m 7s
build and test (cabal) (8.8.4, 3.10.2.0, ubuntu-latest)	7m 31s
build and test (cabal) (8.8.4, 3.10.2.0, macOS-latest)	13m 41s
build and test (cabal) (8.10.7, 3.10.2.0, ubuntu-latest)	7m 42s
build and test (cabal) (8.10.7, 3.10.2.0, macOS-latest)	13m 34s
build and test (cabal) (9.0.2, 3.10.2.0, ubuntu-latest)	8m 12s
build and test (cabal) (9.0.2, 3.10.2.0, macOS-latest)	14m 45s
build and test (cabal) (9.2.8, 3.10.2.0, ubuntu-latest)	7m 42s
build and test (cabal) (9.2.8, 3.10.2.0, macOS-latest)	14m 9s
build and test (cabal) (9.4.8, 3.10.2.0, ubuntu-latest)	7m 54s
build and test (cabal) (9.4.8, 3.10.2.0, macOS-latest)	15m 26s
build and test (cabal) (9.6.4, 3.10.2.0, ubuntu-latest)	6m 48s
build and test (cabal) (9.6.4, 3.10.2.0, macOS-latest)	15m 36s
build and test (cabal) (9.8.1, 3.10.2.0, ubuntu-latest)	6m 39s
build and test (cabal) (9.8.1, 3.10.2.0, macOS-latest)	16m 6s
	3h 23m 1s

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