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changed title in vignette

gatoravi/GenVisR,jkunisak/GenVisR,griffithlab/GenVisR,ahwagner/GenVisR,zlskidmore/GenVisR,hjanime/GenVisR,Alanocallaghan/GenVisR,zskidmor/GGgenome,zskidmor/GenVisR,griffithlab/GGgenome