netflow_generator 0.2.0

Generator for Netflow Cisco V5, V7, V9, IPFIX
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# 0.2.0
* **BREAKING**: File output now exports to PCAP format instead of raw binary
  - Generated pcap files include proper Ethernet/IP/UDP headers
  - Files can be analyzed with Wireshark, tcpdump, and other pcap tools
  - Destination IP/port from `--dest` argument is used in pcap headers
* **Safety**: Complete rewrite of all type conversions and arithmetic to use safe operations
  - Replaced all `as` casts with `try_from()` with proper error handling
  - Replaced all arithmetic (`+`, `-`, `*`, `/`) with checked operations (`checked_add()`, etc.)
  - Prevents silent overflow, truncation, and potential panics
  - Added comprehensive error messages for invalid packet sizes and overflows
* **Dependencies**: Added `pcap-file` v2.0 for pcap file generation
* **Quality**: Zero clippy warnings, all tests passing

# 0.1.0
* Initial public release
* Support for NetFlow v5, v7, v9, and IPFIX
* YAML configuration support
* Continuous and single-shot modes
* UDP transmission support
* File output (raw binary format)

# 0.0.1
* Initial development release