v2.0.0

Changelog

• f4a1b9d added usage(), see also STATUS.md for other changes
• 954d593 build binary for ./cmd/chars
• bcbb7e5 incrementally read file in chunks as to not consume too much memory
• b97e69b initial commit
• 7835f54 make chars a package; add json output
• 880f080 many changes as decribed in STATUS.md
• 8945391 rename FileStat struct to SpecialChars
• 60da656 rework isText()
• d5a9053 update Usage, Exmaples, and Acknowledgments
• c5b8129 updated version number
• b8d639f use - to read file names from stdin
• c4fe802 use uint64