update readme

Author: nh13

README.md

@@ -62,13 +62,13 @@ be concatenated using the `-` delimiter and placed in the given SAM record tag (
 default).  Similarly, the sample barcode bases from the given read will be placed in the `BC`
 tag.
 
-Metadata about the samples should be given as a headered metadata TSV file with at least the 
+Metadata about the samples should be given as a headered metadata TSV file with at least the
 following two columns present:
 
-1. `sample_id` - the id of the sample or library. 
+1. `sample_id` - the id of the sample or library.
 2. `barcode` - the expected barcode sequence associated with the `sample_id`.
 
-For reads containing multiple barcodes (such as dual-indexed reads), all barcodes should be 
+For reads containing multiple barcodes (such as dual-indexed reads), all barcodes should be
 concatenated together in the order they are read and stored in the `barcode` field.
 
 The read structures will be used to extract the observed sample barcode, template bases, and
@@ -154,7 +154,7 @@ Options:
           [default: 2]
 
   -t, --threads <THREADS>
-          The number of threads to use. Cannot be less than 3
+          The number of threads to use. Cannot be less than 5
 
           [default: 8]