dep-dev: bump rspec-rails from 5.1.0 to 5.1.1

Bumps rspec-rails from 5.1.0 to 5.1.1.

Changelog

Sourced from rspec-rails's changelog.

Development

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Commits

• 056432f Version 5.1.1
• f21521a Changelog for #2578
• d7e5638 Merge pull request #2578 from rspec/have-enqueued-mail-fix
• 6f029a8 Add regression check for mailer with global job is and fix swapped argument bug
• 29a0f93 Fix Ruby 2.2 builds
• d50d527 Update RSpec gem versions
• See full diff in compare view

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