docs: refresh README with email/random packages and Go 1.23 floor

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: vishr

README.md

@@ -1,6 +1,17 @@
 # Gommon [![GoDoc](http://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)](http://godoc.org/github.com/labstack/gommon) [![Coverage Status](http://img.shields.io/coveralls/labstack/gommon.svg?style=flat-square)](https://coveralls.io/r/labstack/gommon)
 
-Common packages for Go
-- [Bytes](https://github.com/labstack/gommon/tree/master/bytes) - Format/parse bytes.
-- [Color](https://github.com/labstack/gommon/tree/master/color) - Style terminal text.
-- [Log](https://github.com/labstack/gommon/tree/master/log) - Simple logging.
+Common packages for Go.
+
+Requires Go 1.23 or later.
+
+- [Bytes](https://github.com/labstack/gommon/tree/master/bytes) — format/parse byte sizes (binary IEC and decimal SI).
+- [Color](https://github.com/labstack/gommon/tree/master/color) — style terminal text.
+- [Email](https://github.com/labstack/gommon/tree/master/email) — send email over SMTP; supports STARTTLS and implicit TLS (SMTPS, port 465).
+- [Log](https://github.com/labstack/gommon/tree/master/log) — simple leveled logger with text and JSON output.
+- [Random](https://github.com/labstack/gommon/tree/master/random) — cryptographically secure random strings over configurable charsets.
+
+## Install
+
+```sh
+go get github.com/labstack/gommon
+```