nvim: init.vim: Add fzf-checkout for fuzzy checking out branches

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/.config/nvim/init.vim

@@ -23,6 +23,7 @@ Plug 'rhysd/git-messenger.vim', { 'on': 'GitMessenger' }
 Plug 'rhysd/conflict-marker.vim'
 Plug 'whiteinge/diffconflicts'
 Plug 'salcode/vim-interactive-rebase-reverse'
+Plug 'stsewd/fzf-checkout.vim'
 " Boost vim command line mode
 Plug 'vim-utils/vim-husk'
 " Rainbow Parentheses