update README

Author: yztxwd

README.md

@@ -67,7 +67,7 @@ concept_fscores_dataframe, motif_cav_trainers, bed_cav_trainer = run_tpcav(
     model=model,
     layer_name=layer_name,
     motif_file=motif_path,
-    motif_file_fmt='meme',
+    motif_file_fmt='meme',  # specify your motif file format, either meme or consensus (tab delimited file in form [motif_name, consensus_sequence])
     genome_fasta=genome_fasta,
     num_motif_insertions=[4, 8],
     bed_seq_file=bed_seq_concept,