Bump github.com/pkg/errors from 0.8.0 to 0.8.1

[dependabot-preview]

Bumps github.com/pkg/errors from 0.8.0 to 0.8.1.

Release notes

Sourced from github.com/pkg/errors's releases.

errors 0.8.1

pkg/errors 0.8.1 is a bug fix release for errors 0.8.0. It will be the last version to support Go 1.8 and below. pkg/errors 0.9 and above will require Go 1.9 for the new runtime.CallersFrames API.

pkg/errors 0.8.1 also adds one new feature, errors.WithMessagef. Ideally this would be held over til 0.9, but that complicates the switch to runtime.CallersFrames.

Improvements

• Added errors.WithMessagef. Thanks chemicL.

Bugs fixed

• .travis.yml. Adjust Go versions. Thanks AlekSi, dvrkps, HaraldNordgren, and komuw
• Fixed gofmt. Thanks tariq1890
• Copyedit the package documentation. Thanks seh, TomSweeneyRedHat, nicksnyder, and beono
• Remove unreachable code. Thanks philoserf and haya14busa
• Move benchmark error sink to global variable. Thanks bradleyfalzon
• Fix minor newline consistency issues in test files. Thanks nmiyake
• Add doc comment for exported Format func. Thanks mrhwick and ihrwein

Commits

• ba968bf gofmt -w errors.go (#179)
• 059132a Update .travis.yml (#168)
• d58f942 Bump Travis versions (#172)
• 2233dee Copyedit the package documentation (#135)
• e981d1a Add WithMessagef function (#118)
• c059e47 fixed spelling (#156)
• 816c908 travis.yml: add Go 1.10 (#154)
• 30136e2 Remove deadcode (#146)
• e881fd5 Fix minor typo in README.md (#142)
• 8842a6e Add badge for number of dependent libraries (#109)
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #220.