readme update

README.md

@@ -37,7 +37,7 @@ As a minimum, Athena requires 3 input files. These are a bed file for the gene p
 - transcript file: `chromosome  start  end  gene  transcript  exon`
 - coverage file: `chromosome  start  end  coverage`
 
-n.b. the process for creating the transcript file may be found [here][transcript-file-url]
+n.b. the process for creating the transcript file may be found [here][transcript-file-url].
 
 ### Annotating BED file
 The BED file containing regions of interest is first required to be annotated with gene, exon and coverage information prior to analysis. This may be done using [BEDtools intersect][bedtools-intersect-url], with a file containing transcript to gene and exon information, and then the per base coverage data. Currently, 100% overlap is required between coordinates in the panel bed file and the transcript annotation file, therefore you must ensure any added flank regions etc. are the same.<br>