Bump github.com/kelseyhightower/envconfig from 1.3.0 to 1.4.0

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Bumps github.com/kelseyhightower/envconfig from 1.3.0 to 1.4.0.

Release notes

Sourced from github.com/kelseyhightower/envconfig's releases.

1.4.0

• improved boolean parsing
• support for encoding.BinaryUnmarshaler
• CheckDisallowed function to validate a spec struct against the environment
• improvement to word splitting for uppercase words
• go module support!
• various error message and documentation improvements

Commits

• 0b417c4 Process values bound for []byte fields like strings.
• d3cf2cd readme: Document required but empty behavior for #71 (#110)
• 54c0e69 Fix error message when required field with alternate name is missing (#111)
• cf83b78 Fixed comments for Usage() function (#118)
• 32bf118 update fixture
• a52ba04 Parse empty string as an empty slice of numbers (#119)
• 2c13623 Adding an example of having more than one tag (#121)
• ac92ffb gofmt -w, thanks for the reminder @​whilei
• df743c7 Add go.mod file. (#139)
• a10ce91 Update testdata for the acronym fix #140
• Additional commits viewable in compare view

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