Fix typo in Rust README.md
Fix typo in Rust README.md

drpowell/biotool,drpowell/biotool,drpowell/biotool,lonsbio/biotool,biotool-paper/biotool,lonsbio/biotool,biotool-paper/biotool,biotool-paper/biotool,drpowell/biotool,biotool-paper/biotool,drpowell/biotool,drpowell/biotool,biotool-paper/biotool,biotool-paper/biotool,biotool-paper/biotool,biotool-paper/biotool,bionitio-team/bionitio,lonsbio/biotool,drpowell/biotool,lonsbio/biotool,drpowell/biotool,biotool-paper/biotool,drpowell/biotool,biotool-paper/biotool,drpowell/biotool