Bump dotenv from 3.1.5 to 3.1.6 #24

Job	Run time
bundle-audit / build	1m 57s
spec-jobs / build	2m 8s
spec-admin-controllers / build	2m 8s
brakeman / build	2m 19s
spec-mailers / build	1m 32s
spec-models / build	5m 29s
spec-public-controllers / build	2m 7s
cucumber-admin / build	2m 17s
cucumber-public / build	2m 13s
javascript / build	1m 22s
spec-other / build	1m 33s
spec-requests / build	3m 24s
	28m 29s

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