Bump json from 2.9.0 to 2.9.1 #30

Job	Run time
spec-public-controllers / build	2m 20s
spec-admin-controllers / build	2m 18s
brakeman / build	1m 7s
javascript / build	1m 31s
bundle-audit / build	1m 1s
spec-jobs / build	2m 25s
spec-mailers / build	1m 38s
spec-models / build	3m 59s
spec-other / build	1m 34s
spec-requests / build	3m 31s
cucumber-admin / build	2m 40s
cucumber-public / build	2m 25s
	26m 29s

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