Add DayOfWeek ToSchema instance. #57

Job	Run time
build and test (cabal) (8.6.5, 3.10.2.0, ubuntu-latest)	8m 6s
build and test (stack) (ubuntu-latest)	10m 24s
build and test (cabal) (8.6.5, 3.10.2.0, macOS-latest)	12m 7s
build and test (stack) (macOS-latest)	17m 16s
build and test (cabal) (8.8.4, 3.10.2.0, ubuntu-latest)	7m 40s
build and test (cabal) (8.8.4, 3.10.2.0, macOS-latest)	10m 54s
build and test (cabal) (8.10.7, 3.10.2.0, ubuntu-latest)	7m 47s
build and test (cabal) (8.10.7, 3.10.2.0, macOS-latest)	11m 42s
build and test (cabal) (9.0.2, 3.10.2.0, ubuntu-latest)	8m 7s
build and test (cabal) (9.0.2, 3.10.2.0, macOS-latest)	18m 8s
build and test (cabal) (9.2.8, 3.10.2.0, ubuntu-latest)	7m 33s
build and test (cabal) (9.2.8, 3.10.2.0, macOS-latest)	15m 32s
build and test (cabal) (9.4.8, 3.10.2.0, ubuntu-latest)	7m 50s
build and test (cabal) (9.4.8, 3.10.2.0, macOS-latest)	16m 46s
build and test (cabal) (9.6.4, 3.10.2.0, ubuntu-latest)	7m 2s
build and test (cabal) (9.6.4, 3.10.2.0, macOS-latest)	11m 0s
build and test (cabal) (9.8.1, 3.10.2.0, ubuntu-latest)	6m 50s
build and test (cabal) (9.8.1, 3.10.2.0, macOS-latest)	15m 23s
	3h 20m 7s

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