build: bump rspec-core from 3.8.0 to 3.8.1 in /Library/Homebrew

[dependabot-preview]

Bumps rspec-core from 3.8.0 to 3.8.1.

Changelog

Sourced from rspec-core's changelog.

3.8.1 / 2019-06-13

Full Changelog

Bug Fixes:

• Handle RSpec description(s) with japanese chars in CP932 encoded files.
  (Benoit Tigeot, #2575)
• When defining let methods that overwrite an existing method, prevent
  a warning being issued by removing the old definition. (Jon Rowe, #2593)
• Prevent warning on Ruby 2.6.0-rc1 (Keiji Yoshimi, #2582)
• Fix config.define_derived_metadata so that it supports cascades.
  (Myron Marston, #2630).

Commits

• 57e8319 3.8.1
• 61a9434 Fix define_derived_metadata so that it supports cascades. (#2630)
• f663a4b Updated travis build scripts (from rspec-dev) (#2619)
• 9587457 Updated travis build scripts (from rspec-dev) (#2612)
• ddd98ff Move Contributing section to later in README (#2607)
• 8480006 Cleanup after fixing JRuby (#2598)
• 2ddd363 Prevent ffi and childprocess causing build failures (#2595)
• ba6590a Revert change to generated description
• 99e1bcf sync appveyor with master
• 5d48f78 Cleanup after fixing JRuby (#2598)
• Additional commits viewable in compare view

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