build

Added cancel and close events #23

Job	Run time
lint-fmt	12m 9s
build (ubuntu-latest, 4.08.x, true, true, true)	11m 44s
build (ubuntu-latest, 4.09.x, true, true, true)	12m 32s
build (ubuntu-latest, 4.10.x, true, true, true)	10m 26s
build (ubuntu-latest, 4.11.x, true, true, true)	10m 24s
build (ubuntu-latest, 4.12.x, true, true, true)	10m 2s
build (ubuntu-latest, 4.13.x, true, true, true)	9m 54s
build (ubuntu-latest, 5.0.x, true, true, true)	9m 57s
build (ubuntu-latest, 4.14.x, true, false, true)	11m 3s
build (macos-latest, 4.14.x, true, false, true)	25m 16s
build (windows-latest, 4.14.x, true, false, true)	39m 39s
build (ubuntu-latest, 5.1.x, false, false, false)	12m 21s
build (macos-latest, 5.1.x, true, false, true)	20m 38s
build (windows-latest, ocaml.5.1.0,ocaml-option-mingw, false, false, true)	35m 41s
	3h 51m 46s

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