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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Code Coverage Report: Only Changed Files listed

Package	Coverage
Overall Coverage	🟢 85%

Minimum allowed coverage is 0%, this run produced 85%