v2.0.0

Breaking change since v1.0.0

• Numeric aliases are no longer valid as -1 could be interpreted as both minus 1 and option 1.

Other changes

• unicode option names (e.g. --один) are now valid
• improved error handling
  • all exceptions thrown now have names to aid distinction
  • more validation rules added to catch issues with the supplied option definitions
• updated docs
• the codebase is now ES6 (with babel-compiled ES5 fallback) and will run natively where possible