Bump github.com/alecthomas/kong from 0.2.17 to 0.2.19

[dependabot[bot]]

Bumps github.com/alecthomas/kong from 0.2.17 to 0.2.19.

Commits

• d564bd2 Add test for #244.
• 342263c Fix docs re. Help() interface.
• ff839dc Fix env var interpolation (#236)
• f00d33b Use reflect-compatible struct tags in examples
• 79f896f feat: add support for variable interpolation into env tag key (#234)
• 5090305 Add help testcase for envprefix + no env.
• ea18c73 Only prepend EnvPrefix if .Env is not empty.
• 2770a34 Add envprefix tag
• 749d3f0 Allow root application to have a Run(...) error method.
• 5c7b038 Rename IgnoreFieldsRegex -> IgnoreFields.
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 45.044% when pulling 21780130102a6ac6ad66e171470e115659dc3185 on dependabot/go_modules/github.com/alecthomas/kong-0.2.19 into 3fce7a22c765911a41612e138a2459e3d36e36e3 on master.

[dependabot[bot]]

Superseded by #103.