Update README.md

Author: jaebeom-kim

README.md

@@ -13,7 +13,7 @@ Presentation video from ISMB/ECCB 2023: [link](https://www.youtube.com/watch?v=v
 
 ## Update in v1.0.4
 - Fixed a minor reproducibility issue.
-- Fixed a bug occuring with sequences containing lowercased bases.
+- Fixed a performance-harming bug occurring with sequences containing lowercased bases.
 - Auto adjustment of `--match-per-kmer` parameter. Issue #20 solved.
 - Record version info. in `db.parameter`