fix typo

README.md

@@ -163,7 +163,7 @@ In the two preceding steps, you will obtain a k-mer sketch file in zip format (i
 
 In our benchmark with `GTDB representive genomes`, it takes `15 minutes` using `16 threads, 50GB of MEM` on a system equipped with a `3.5GHz AMD EPYC 7763 64-Core Processor`. The processing time can be significant when executed on GTDB all genomes OR with limited resources. If only part of genomes are needed, one may use `sourmash sig` command to extract signatures of interests only. 
 
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 The script `make_training_data_from_sketches.py` extracts the sketches from the Zipfile-format reference database, and then turns them into a form usable by YACHT. In particular, it removes one of any two organisms that have ANI greater than the user-specified threshold as these two organisms are too close to be "distinguishable".