v0.3.0 - bugfix and new features

• Fix: reflect.Pointer when using with Go below 1.18.
• Fix: error handling for invalid command.
• New: add options ReplaceUsage and WithFooter to customize usage help.
• Change: refactor code for better maintainability.

v0.2.1 - New features

Improve compatibility with flag.FlagSet.

v0.2.0 - New features

New features:

• support alternative 'mcli' tag
• support global flags
• support keep command order in help
• improve examples and docs

v0.1.1 - Move to standalone repo

move to seperate repository

Change-Id: Ie2b083f393897cd7870fa8f183be3c9275155d45