这是我的 .vimrc 文件：
set nocompatible " be iMproved, required
filetype off " required
" set the runtime path to include Vundle and initialize
set rtp+=$HOME/.vim/bundle/Vundle.vim/
call vundle#begin('$HOME/.vim/bundle/')
" let Vundle manage Vundle, required
Plugin 'VundleVim/Vundle.vim'
" Plugin gruvbox
Plugin 'morhetz/gruvbox'
" All of your Plugins must be added before the following line
call vundle#end() " required
filetype plugin indent on " required
colorscheme gruvbox
用vim打开文件没问题，但是打字时> vim example.txt不显示gruvbox colorscheme，我用的是windows，怎么解决？