{AH} move htslib etc versions to 1.5 on travis
{AH} move htslib etc versions to 1.5 on travis

kyleabeauchamp/pysam,pysam-developers/pysam,pysam-developers/pysam,kyleabeauchamp/pysam,kyleabeauchamp/pysam,kyleabeauchamp/pysam,pysam-developers/pysam,pysam-developers/pysam,kyleabeauchamp/pysam