Update README.md

Author: DRL

README.md

@@ -172,7 +172,7 @@ usage: blobtools plot    -i BLOBDB [-p INT] [-l INT] [-c] [-n] [-s]
 ## Additional features
 
 ### blobtools bam2cov
-- covert bam to cov
+- extract base-coverage for each contig from BAM file
 ```
 usage: blobtools bam2cov         -i FASTA -b BAM [-h|--help]