Merge pull request #11 from input-output-hk/jdral/lockstep-model #91

Job	Run time
cabal-check (9.6.2, 3.10.1.0, ubuntu-latest)	26s
stylish-haskell (9.2.8, 3.10.1.0, ubuntu-latest)	2m 53s
cabal-fmt (9.2.8, 3.10.1.0, ubuntu-latest)	2m 22s
build (8.10.7, 3.10.1.0, ubuntu-latest)	2m 12s
build (8.10.7, 3.10.1.0, windows-latest)	8m 0s
build (8.10.7, 3.10.1.0, macOS-latest)	4m 25s
build (9.2.8, 3.10.1.0, ubuntu-latest)	2m 27s
build (9.2.8, 3.10.1.0, windows-latest)	6m 32s
build (9.2.8, 3.10.1.0, macOS-latest)	1m 15s
build (9.4.6, 3.10.1.0, ubuntu-latest)	2m 34s
build (9.4.6, 3.10.1.0, windows-latest)	3m 25s
build (9.4.6, 3.10.1.0, macOS-latest)	5m 41s
build (9.6.2, 3.10.1.0, ubuntu-latest)	1m 17s
build (9.6.2, 3.10.1.0, windows-latest)	9m 54s
build (9.6.2, 3.10.1.0, macOS-latest)	1m 30s
	54m 53s

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