increase default zoom level for readviz
increase default zoom level for readviz

konradjk/exac_browser,macarthur-lab/gnomad_browser,konradjk/exac_browser,macarthur-lab/gnomad_browser,macarthur-lab/gnomad_browser,konradjk/exac_browser,macarthur-lab/gnomad_browser,macarthur-lab/gnomad_browser