fixed argument usage

main.py

@@ -31,7 +31,7 @@ if run=="command_line":
     out_detail=pos_seg.split("/")[-1].split(".")[0:-1][0]+"_detail.gff"
     out_var=pos_seg.split("/")[-1].split(".")[0:-1][0]+"_variations.txt"
     if len(sys.argv)==5:
-        target_genome_name=sys.argv[5]
+        target_genome_name=sys.argv[4]
     else:
         target_genome_name=pos_seg.split("/")[-1].split(".")[0:-1][0]