add acceptance rate info to Transition struct #277

Job	Run time
test (1.6, ubuntu-latest, x86)	2m 42s
test (1.6, ubuntu-latest, x64)	2m 23s
test (1.6, macOS-latest, x64)	2m 33s
test (1.6, windows-latest, x86)	9m 43s
test (1.6, windows-latest, x64)	7m 24s
test (1, ubuntu-latest, x86)	2m 45s
test (1, ubuntu-latest, x64)	2m 17s
test (1, macOS-latest, x64)	2m 35s
test (1, windows-latest, x86)	6m 2s
test (1, windows-latest, x64)	2m 58s
test (nightly, ubuntu-latest, x86)	3m 25s
test (nightly, ubuntu-latest, x64)	2m 52s
test (nightly, macOS-latest, x64)	8m 17s
test (nightly, windows-latest, x86)	5m 45s
test (nightly, windows-latest, x64)	3m 52s
	1h 5m 33s

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