Update rubocop-rspec to version 3.0.3 #194

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Run time

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Job	Run time
windows (2.7)	3m 8s
check (1.9)	8s
windows (3.0)	1m 11s
check (2.7)	21s
windows (3.1)	1m 15s
check (3.0)	12s
windows (3.2)	1m 13s
check (3.1)	13s
windows (3.3)	1m 9s
check (3.2)	9s
check (3.3)	11s
check (jruby-9.3)	15s
check (jruby-9.4)	34s
	9m 59s