chore: Changelog

feat: release 1.0.0 (#11)

* feat: prepare 1.0.0 release

Fix critical bug where read_response_in never validated response status
codes against expected statuses, causing commands like cwd, mkd, dele,
quit, noop to silently accept server error responses. Fix feat to expect
status.System (211) per RFC 2389 instead of status.CommandOk (200).
Remove unused FtpError variants (SecureError, DataConnectionAlreadyOpen).
Fix doc typos and expand README with comprehensive usage guide.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* docs: enrich module and function doc comments with examples

Add comprehensive examples to module-level and function-level doc
comments for hexdocs.pm. Covers connection, FTPS, data modes, file
operations, directory listings, error handling, and custom commands.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* test: Use assert instead of should

* style: format