Regenerate gemspec for version 0.7.0
Regenerate gemspec for version 0.7.0

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