Fix Rails/StrongParametersExpect to allow safe navigation operator on optional params #969

Job	Run time
Check documentation syntax	13s
Check the oldest supported RuboCop version	33s
Prism	37s
Spec - JRuby	2m 22s
Spec - 3.4	21s
Spec - 3.1	29s
Spec - 3.2	20s
Spec - 3.0	25s
Spec - 3.3	22s
Spec - head	16s
Spec - 2.7	33s
Spec - 4.0	19s
	6m 50s

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