Version 0.1.8: Soundness hotfix

This version fixes an unsoundness issue (that would unlikely to be a real security issue but may be in the future).

Crates.io: https://crates.io/crates/ffuzzy/0.1.8
Docs.rs: https://docs.rs/ffuzzy/0.1.8/ssdeep/

Full Changelog: v0.1.7...v0.1.8