Allow for VCF with a single header line
Allow for VCF with a single header line

CuppenResearch/bioruby-vcf,pjotrp/bioruby-vcf,gusevfe/bioruby-vcf,pjotrp/bioruby-vcf,pjotrp/bioruby-vcf,gusevfe/bioruby-vcf,CuppenResearch/bioruby-vcf,CuppenResearch/bioruby-vcf,gusevfe/bioruby-vcf