write a test for #8 (fix is in github.com/brentp/bix)
write a test for #8 (fix is in github.com/brentp/bix)

brentp/vcfanno,brentp/vcfanno,brentp/vcfanno,seandavi/vcfanno,seandavi/vcfanno,seandavi/vcfanno