xlavir v0.5.1 (2021-08-04) - bugfix patch release

• Fixed issue (#12) where iVar ref allele depth corresponds to depth of base before deletion. For indels, ref allele depth is taken from the total depth minus the alt allele depth.
• Fixed issue (#14) where the total number of reads from samtools flagstat may not be the true number of reads. The unmapped reads may be excluded from the BAM file so the samtools flagstat total number of reads may be equal to the number of mapped reads. There is now a search for fastp JSON files to get the true total number of reads.