docs: Update README for v3.0 release
Added documentation for new v3.0 features: 🔐 Encryption (AES-256-GCM): - Added encryption section with examples - Key generation, backup, and restore examples - Environment variable and passphrase support - PBKDF2 key derivation details - Automatic decryption on restore 📦 Incremental Backups (PostgreSQL & MySQL): - Added incremental backup section with examples - Full vs incremental backup workflows - Combined encrypted + incremental examples - Restore incremental backup instructions - Space savings details (70-95% typical) Version Updates: - Updated Key Features section - Version bump to 3.0.0 in main.go - Added v3.0 badges to new features Total: ~100 lines of new documentation Status: Ready for v3.0 release
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