travis-setup.sh: fix URL: s/neovim-/nvim-/ (#93)
travis-setup.sh: fix URL: s/neovim-/nvim-/ (#93)

Fixes #92
neovim/bot-ci,neovim/bot-ci,ZyX-I/neovim-bot-ci,neovim/bot-ci,ZyX-I/neovim-bot-ci,ZyX-I/neovim-bot-ci