Update dependency rubocop-rspec to v3.1.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rubocop-rspec (changelog)	'3.0.5' -> '3.1.0'

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Release Notes

rubocop/rubocop-rspec (rubocop-rspec)

v3.1.0

Compare Source

• Add RSpec/StringAsInstanceDoubleConstant to check for and correct strings used as instance_doubles. ([@​corsonknowles])
• Fix false-positive for RSpec/UnspecifiedException when a method is literally named raise_exception. ([@​aarestad])
• Fix false-positive for RSpec/UnspecifiedException when not_to raise_error is used within a block. ([@​aarestad], [@​G-Rath])

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[yegor256]

@rultor please, try to merge, since 11 checks have passed

[rultor]

@rultor please, try to merge, since 11 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 11 checks have passed

@yegor256 Done! FYI, the full log is here (took me 9min)