v0.3.0

Changes

• Convert tables to Markdown format instead of raw HTML
• Add dry-run option for push command with diff display
• Show diff on all pushes (not just dry-run)
• Change push command to positional arguments supporting multiple files
  • push <files...> instead of push --file <path>
• Add HTML roundtrip test suite (18 test cases)
• Add npm test script

Breaking Changes

• Push command syntax changed from push --file <path> to push <files...>