README: Mention emailbook-hare and the benchmark

Version 0.2.1

Add run-tests.sh and utils.sh (from emailbook-janet)

parse test: Export LC_ALL=C for an env independent sort order

Bug fix: sort test/book-expected.txt

Bug fix: Correct case pattern in add

Version 0.2.0

Sort and deduplicate new mailboxes before adding them

Avoid repeated sed and grep calls

Skip lines containing non-ASCII characters

Mention emailbook-janet

Skip lines/mailboxes not containing an @

Also ignore mailboxes containing 'NoReply'

Also ignore mailboxes containing 'not-reply'

Example: <do-not-reply@stackoverflow.com>

Bug fix: Stop parsing also at empty CRLF line

Bug fix: Replace return with continue

README.md: Update differences with aercbook

Initial commit