Fix Rails/StrongParametersExpect to allow safe navigation operator on optional params #970

Job	Run time
Check the oldest supported RuboCop version	30s
Spec - JRuby	2m 41s
Spec - 3.1	29s
Prism	32s
Spec - 4.0	16s
Spec - 3.4	18s
Check documentation syntax	11s
Spec - 3.2	19s
Spec - 3.3	21s
Spec - 2.7	31s
Spec - head	17s
Spec - 3.0	29s
	6m 54s

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