v0.1.9 Required description for breaking changes

⚠️ BREAKING CHANGES
- The -B/--breaking flag now requires a description argument instead of
  being a boolean to satisfy Conventional Commits requirements.
  Migration: Use -B "description" instead of just -B.

✨ Features
- cli: required a description argument for the breaking change flag
- cli: validated presence of BREAKING CHANGE footer when using -B
- cli: restored the -a/--amend flag

🐛 Bug Fixes
- cli: resolved type mismatch for breaking change variable
- body: decoded HTML entities after sanitization to preserve quotes
- body: maintained indentation for preformatted code blocks

📚 Documentation
- readme: added REUSE and Liberapay badges
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