Update dependency rubocop-rspec to v3.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rubocop-rspec (changelog)	'3.3.0' -> '3.4.0'

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Release Notes

rubocop/rubocop-rspec (rubocop-rspec)

v3.4.0

Compare Source

• Fix RSpec/SortMetadata cop to limit sorting to trailing metadata arguments. ([@​cbliard])
• Replace RSpec/StringAsInstanceDoubleConstant with RSpec/VerifiedDoubleReference configured to only support constant class references. ([@​corsonknowles])
• Fix RSpec/EmptyExampleGroup cop false positive when a simple conditional is used inside an iterator. ([@​lovro-bikic])

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[yegor256]

@rultor please, try to merge, since 5 checks have passed

[rultor]

@rultor please, try to merge, since 5 checks have passed

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here.

[rultor]

@rultor please, try to merge, since 5 checks have passed

@yegor256 Done! FYI, the full log is here (took me 17min).