build(deps): bump github.com/hashicorp/go-multierror from 1.0.0 to 1.1.1

Bumps github.com/hashicorp/go-multierror from 1.0.0 to 1.1.1.

Commits

• 9974e9e Merge pull request #50 from sethvargo/sethvargo/npe
• 0023bb0 Check if multierror is nil in WrappedErrors
• ab6846a we require go 1.13
• cb869d9 Merge pull request #49 from hashicorp/fix-ci-config
• af59c66 Upgrade gotestsum version
• eabd672 Fix CI config
• 7795f06 Merge pull request #47 from hashicorp/mwhooker-patch-1
• e27d231 update badges to use circle
• 78708db Carry over some changes from #26
• c7dd669 Merge pull request #27 from mdeggies/add-circleci
• Additional commits viewable in compare view

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