Update README.md

README.md

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 #### Introduction
-The bcftools-merge is used to merge VCF files into a singe VCF.
-
+The bcftools-merge is used to merge VCF files into a singe VCF.  
 A common scenario is that after generating all VCF files you want to include in the panel, you can use bcftools-merge to merge them into a single Panel of Normal VCF.
 
 #### Usage