nvim: Update Neovim configuration

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

nvim/init.vim

@@ -72,6 +72,8 @@ let g:gitgutter_max_signs=10000
 let mapleader="\<SPACE>"
 
 set encoding=utf-8
+set exrc                " Allow loading local .nvimrc files
+set secure              " Disallow use of autocmd, shell and write in local rc
 set showcmd             " Show (partial) command in status line.
 set showmatch           " Show matching brackets.
 set showmode            " Show current mode.