Bump github.com/alexflint/go-arg from 1.4.3 to 1.5.1

[dependabot]

Bumps github.com/alexflint/go-arg from 1.4.3 to 1.5.1.

Release notes

Sourced from github.com/alexflint/go-arg's releases.

v1.5.1

• Fixes a bug introduced in v1.5.0 where bad struct tags and other parser-level initialization problems would result in a crash rather than a clean exit in MustParse (thanks @​hhromic !)

Version 1.5.0

• Argument structs can define Description() and Epilogue(), which are added to the usage string

• Subcommands can have multiple aliases like this:

var args struct {
    Remove *struct{} `arg:"subcommand:remove|rm|r" help:"remove something from somewhere"`
}

• Improves formatting of usage string when the placeholder tag is set to empty string

• Do not handle --version when the args struct lacks a Version() function

• Add StructSubcommands to Config struct

Commits

• bee5cf5 Merge pull request #255 from hhromic/fix-254
• aa844c7 Fix crash on errors in package-level MustParse
• dfca71d Merge pull request #243 from alexflint/handle-empty-placeholder
• 188bd31 Merge pull request #244 from alexflint/restore-100pct-coverage
• 8a91726 add a test case with single-level subcommands
• 3ddfffd add test for help and usage when a --version flag is present
• 68948b2 restore 100% code coverage
• be792f1 ping
• 8e35a4f handle explicit empty placeholders
• bf629a1 Merge pull request #231 from alexflint/subcommand-aliases
• Additional commits viewable in compare view

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