Update README.md

README.md

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+This fork add the following functionality to umis
+- sb_filter(fastq, bc, cores, nedit):
+    Filters reads with non-matching sample barcodes
+    Expects formatted fastq files.
+- mb_filter(fastq, cores):
+    Filters umis with non-ACGT bases
+    Expects formatted fastq files
+- add_uid(fastq, cores):
+    Adds unique identifier, UID:[samplebc cellbc umi], to readname for umi-tools deduplication
+    Expects formatted fastq files with correct sample and cell barcodes.
+- barcode hashes additionaly include "N" base so these are now corrected when using edit distances
+
+
 # umis