Use F3 to toggle wrapping instead of less useful 'relativenumber'

dotfiles/vim/vimrc

 set updatetime=100
 set t_vb=
 set pastetoggle=<F4>
-nmap <F3> :set relativenumber!<CR>
+nmap <F3> :set wrap!<CR>
 
 if has('mouse')
   set mouse=a