Support auto-correction for Performance/Caller

[koic]

This PR supports auto-correction for Performance/Caller.

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Before submitting the PR make sure the following are checked:

• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Added an entry to the Changelog if the new code introduces user-observable changes. See changelog entry format.
• The PR relates to only one subject with a clear title
  and description in grammatically correct, complete sentences.
• Run bundle exec rake default. It executes all tests and RuboCop for itself, and generates the documentation.

[IsaacDempsey]

Why is this best practice? Can't find any documentation on this.

[marcandre]

Why is this best practice? Can't find any documentation on this.

It requests only the single stack frame desired instead of requesting the full stack trace and throwing away all but one element. Thus much faster.