Upgrade mailcatcher gem #27

Job	Run time
brakeman / build	58s
cucumber-admin / build	2m 24s
bundle-audit / build	48s
cucumber-public / build	2m 14s
javascript / build	1m 8s
spec-admin-controllers / build	3m 21s
spec-jobs / build	3m 58s
spec-mailers / build	1m 25s
spec-models / build	4m 44s
spec-other / build	1m 39s
spec-public-controllers / build	2m 4s
spec-requests / build	3m 11s
	27m 54s

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