Correct typo in comment

bin/filter_species.py

@@ -8,7 +8,7 @@
 #Output: file to write the filtered rows to
 #
 # Example use:
-# $ python filter_species.py -i results/all_taxClassified.tsv -o results/all_taxClassified-E_coli.tsv -i Escherichia_coli
+# $ python filter_species.py -i results/all_taxClassified.tsv -o results/all_taxClassified-E_coli.tsv -s Escherichia_coli
 
 #1. Import required libraries
 import pandas as pd         #to work with dataframes